Updated the docs.

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="generator" content=
"HTML Tidy for Mac OS X (vers 1st June 2003), see www.w3.org" />
<link type="text/css" rel="stylesheet" href="tidy.css" />
<title>HTML Tidy - Frequently Asked Questions</title>
<style type="text/css">
code { font-weight: bold; }
</style>
</head>
<body>
<h1>HTML Tidy - Frequently Asked Questions</h1>
<h2>Overview</h2>
<p class="abstract">Certain questions about Tidy come up on a
regular basis. These are some that have been culled from postings
to the html-tidy@w3.org and tidy-develop@lists.sourceforge.net
mailing lists. If you don't see your question addressed here, see
<a href="#support">How To Get Support</a> below.</p>
<ul>
<li><a href="#what-now">What Now?</a></li>
<li><a href="#support">How to Get Support?</a></li>
<li><a href="#bug">How to Submit A Bug Report</a></li>
<li><a href="#feature">How to Submit A Feature Request</a></li>
<li><a href="#layout">How Do I Control the Output Layout?</a></li>
<li><a href="#version">What Version of Tidy Should I Use?</a></li>
<li><a href="#regression">How Do I Run A Regression Test?</a></li>
</ul>
<hr />
<dl>
<dt><a name="what-now" id="what-now"></a>What Now?</dt>
<dd><p>If you have a popup screen that reads as follows:
<pre>
HTML Tidy for Windows &lt;vers 1st August 2002; built on Aug 8 2002, at 15:41:13&gt;
Parsing Console input &lt;stdin&gt;
</pre>
<p>and do not know what to do next, read on.</p>
<p>Tidy is waiting for your HTML to come in, so it can parse it.
Tidy is fundamentally a tool that reads in HTML cleans it up and
writes it out again. It was developed as a program you run from the
console prompt, but there are GUI encapsulations available, e.g.
HTML-Kit, which you might prefer.</p>
<p>If you are using Windows, the first step is to unzip the zip file
and place the tidy.exe file in a folder somewhere on your executables
path. You may also want to set up a config file to save having to type
lots of options each time you run Tidy. From the console prompt you can
run Tidy like this:</p>
<pre>
C> tidy -m mywebpage.html
</pre>
<p>In this case, the <code>-m</code> option requests Tidy to write
the tidied file back to the same filename as it read from
(mywebpage.html). Tidy will give you a breakdown of the problems it
found and the version of HTML the file appears to be using.</p>
<p>To get a listing of Tidy command line options, just type
<code>tidy -?</code>. To see a listing on configuration options,
try <code>tidy -help-config</code>. To get more info on the
config options, see the <a
href="http://tidy.sourceforge.net/docs/quickref.html">Quick Reference</a>.</p>
<p>See also Dave Raggett's <a href="http://tidy.sourceforge.net/docs/Overview.html#help">User Guide</a>.</p>
<p>If you're not comfortable with the DOS command line, you should
try one of the <a href="http://tidy.sourceforge.net/#tidylibapps">GUI
Applications</a>.</p>
</dd>
<dt><a name="support" id="support"></a>How To Get Support</dt>
<dd>
<p>For general HTML Tidy support, the original mailing list
html-tidy@w3.org is best. Sometimes developers are the last to
know... Also, this list covers both Java and C versions, not to
mention various value-added products such as GUI front ends, Perl
and Python integration, etc. If you don't get a response after a
couple tries or if you have a bug fix, bump it over to the
developer list at tidy-develop@lists.sourceforge.net. It's not a
hard line, but that is the general arrangement.</p>
</dd>
<dt><a name="bug" id="bug"></a>How to Submit A Bug Report</dt>
<dd>
<p>You are encouraged to report bugs you found to the Tidy
developer team. Tidy's quality depends on your feedback. You can
either file your bug report in the Sourceforge <a
href="http://sourceforge.net/tracker/?func=add&amp;group_id=27659&amp;atid=390963">
bug tracker</a> for HTML Tidy (<em>recommended</em>) or send a mail
to the mailing list at html-tidy@w3.org. Note you do <em>not</em>
have to have a Sourceforge account in order to file bug reports, or
be subscribed to html-tidy@w3.org in order to post messages to the
list.</p>
<p>Prior to submitting a bug report, please check that the bug is
not already known. Many are. If you are not sure, just ask. If it
is new bug, make sure to include at least the following information
in your report:</p>
<ul>
<li>A desciption of what you think went wrong.</li>
<li>The HTML Tidy version (find it out by running <code>tidy
-v</code>) and operating system you are running.</li>
<li>The input, that exposes the bug.<br />
A small HTML document that reproduces the problem is best.</li>
<li>The configuration options you've used. Command line options
like<br />
<code>-asxml</code>, configuration files, etc. You may use
<code>tidy -show-config</code> to get an overview of the active
Tidy settings.</li>
<li>Your e-mail address for further questions and comments.</li>
</ul>
<p>These information are necessary to reproduce whatever is
failing, without them we cannot help you. Additional information -
and patches - are very welcome!</p>
<p><em>Please include only one bug per report.</em> Reports with
multiple bugs are less easy to track and some bugs may get
missed.</p>
</dd>
<dt><a name="feature" id="feature"></a>How to Submit A Feature
Request</dt>
<dd>
<p>If you want Tidy to do something new that it doesn't do today
(or stop doing something), then it is probably a feature
request.</p>
<p>The process for submitting a feature request is very similar to
bug requests. A different <a
href="http://sourceforge.net/tracker/?atid=390966&amp;group_id=27659">
tracker</a> is used on SourceForge to denote the difference in
subject matter.</p>
<p>As with bugs, please be sure that the feature has not already
been requested. If the feature has already requested, you can add
your comments to the feature request tracker, or send mail to the
<a href="mailto:html-tidy@w3.org">mailing list</a> indicating your
wish to also have the feature implemented. If the feature has not
already been requested, send the same information as for a bug
report, but place special emphasis on the desired output for a
given input, desired options, etc. - please be as specific as
possible about what you want Tidy to <em>do</em>.</p>
</dd>
<dt><a name="layout" id="layout"></a>How Do I Control the Output Layout?</dt>
<dd>
<p>There are three primary options that control how Tidy
formats your markup:</p>
<ul>
<li><a class="code"
href="quickref.html#indent">indent</a></li>
<li><a class="code"
href="quickref.html#indent-attributes">indent-attributes</a></li>
<li><a class="code"
href="quickref.html#vertical-space">vertical-space</a></li>
</ul>
<p>Briefly, <code>indent</code> sets the level of left-to-right indenting
and, somewhat, how often elements are put onto a new line. The options
are <code>yes</code>, <code>no</code>, and <code>auto</code>.
<code>indent-attributes</code> is a flag that, when set, tells Tidy to
put each attribute on a new line. <code>vertical-space</code> is a flag
that, when set, tells Tidy to add some empty lines for readability. The
default for all three is <code>no</code>. These options may be used in
any combination to control you you want your markup to look. The best
thing is to experiment a bit to see what you like. Be aware that
<code>indent yes</code> is deprecated for production use as it will
cause visual changes in most browsers.</p>
<p>To get Tidy <em>Classic</em> <code>--indent auto</code> layout, use the following options:</p>
<pre>
indent: auto
indent-attributes: no
vertical-space: yes
</pre>
<p>You can read about more <em>Pretty Print</em> options
<a href="quickref.html#PrettyPrintHeader">here</a>.</p>
</dd>
<dt><a name="version" id="version"></a>What Version of Tidy Should
I Use?</dt>
<dd>
<p>The current Source Forge builds are recommended. You can find these at
<a href="http://tidy.sourceforge.net">http://tidy.sourceforge.net</a>.
People continue to report examples where Tidy does not catch some
ill-formed HTML or, worse, generates ill-formed HTML. These cases have
been significantly reduced. That said, be sure to test Tidy with some
representative files from your environment.</p>
<p>For development work, use CVS directly on your development
system. For information on how to pull Tidy sources from <a
href="http://sourceforge.net/cvs/?group_id=27659">CVS</a>. This way
you can keep abreast of changes to Tidy and quickly resolve
conflicts.</p>
<p>For building a front end (e.g. GUI or language binding), the
simplest approach is to use TidyLib. For more information
about building and coding with TidyLib, see the <a
href="http://tidy.sourceforge.net/libintro.html">Introduction To TidyLib</a>.</p>
</dd>
<dt><a name="regression" id="regression">How Do I Run A
Regression Test?</a></dt>
<dd>
<p>You might ask, "Why should I run a regression test?". If you
are a Tidy user, you might want to compare a new version of Tidy
to the version you are currently running. This is a good idea
if you are using Tidy in production applications such as web
publishing. If you are a Tidy developer, it is a good idea to
run the regression test suite to make sure your fix or enhancement
doesn't add new bugs.</p>
<p>Detecting new bugs is easier said than done, because sometimes
they are subtle and can only be seen in browsers (or one particular
browser you don't even have). But you can catch most crashes and
many layout problems by running the test suite as described here.</p>
<p>The basic process is simple: run the test suite <strong>before</strong>
and <strong>after</strong> making changes to TidyLib and compare the output
markup and messages. Be aware that the test scripts for WinNT/2K/XP
(alltest.cmd) and Linux/Unix (testall.sh) place the output files in
<code>tidy/test/tmp</code>. If you forget to run the <strong>before</strong>
test, you can always download a binary from the <a
href="http://tidy.sourceforge.net/#binaries">Project Page</a>. If you
are not a TidyLib developer, you can download the <a
href="http://tidy.sourceforge.net/test/tidy_test.tgz">Test Suite</a>
directly. Here are the steps to evaluate the impact of a TidyLib change.</p>
<h3>For Windows</h3>
<p><strong>Before</strong> making changes:</p>
<pre>
C:\tidy\test> alltest.cmd
C:\tidy\test> ren tmp baseline
</pre>
<p><strong>After</strong> making changes and building Tidy:</p>
<pre>
C:\tidy\test> alltest.cmd
C:\tidy\test> windiff tmp baseline
</pre>
<h3>For Linux/Unix</h3>
<p><strong>Before</strong> making changes:</p>
<pre>
~/tidy/test$ ./testall.sh
~/tidy/test$ mv tmp baseline
</pre>
<p><strong>After</strong> making changes and building Tidy:</p>
<pre>
~/tidy/test$ ./testall.sh
~/tidy/test$ diff -u tmp baseline > diff.txt
</pre>
</dd>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="generator" content="HTML Tidy, see www.w3.org" />
<title>HTML TIDY - Notes on pending work</title>
<meta name="keywords"
content="HTML, validation, error correction, pretty-printing" />
<meta name="author" content="Dave Raggett &lt;dsr@w3.org&gt;" />
<style type="text/css">
body {
margin-left: 10%;
margin-right: 10%;
font-family: sans-serif
}
h1 { margin-left: -8% }
h2,h3,h4,h5,h6 { margin-left: -4% }
pre { color: green; font-weight: bold;
font-size: 80%; font-family: monospace}
em { font-style: italic; font-weight: bold }
strong { text-transform: uppercase; font-weight: bold }
.note {font-style: italic; color: rgb(192, 101, 101) }
//hr {text-align: center; width: 60% }
blockquote {
color: navy;
margin-left: 1%;
margin-right: 1%;
text-align: center;
font-family: "Comic Sans MS", "Times New Roman", serif
}
table {
font-family: sans-serif;
font-size: 80%;
background: rgb(255,255,153)
}
td {
font-size: 80%
}
.people {font-family: "Lucida Calligraphy", serif}
:link { color: rgb(0, 0, 153) }
:visited { color: rgb(153, 0, 153) }
:active { color: rgb(255, 0, 102) }
a :hover { color: rgb(0, 0, 255) }
</style>
<style type="text/css">
p.c1 {font-style: italic}
</style>
</head>
<body bgcolor="#FFFFFF" background="grid.gif" text="black"
link="navy" vlink="black" alink="red">
<h1>HTML TIDY - Notes on Pending Work</h1>
<p><a href="http://www.w3.org/People/Raggett">Dave Raggett</a> <a
href="mailto:dsr@w3.org">dsr@w3.org</a></p>
<p>This is a page where I am keeping the suggestions for
improvements or bug fixes. My current work load means that I
don't get much time to work on HTML Tidy, so I am interested in
offers of help!</p>
<h4>Public Email List for Tidy: &lt;<a
href="mailto:html-tidy@w3.org">html-tidy@w3.org</a>&gt;</h4>
<p>I have set up an archived mailing list devoted to Tidy. To
subscribe send an email to html-tidy-request@w3.org with the word
subscribe in the subject line (include the word unsubscribe if
you want to unsubscribe). The <a
href="http://lists.w3.org/Archives/Public/html-tidy/">archive</a>
for this list is accessible online. Please use this list to
report errors or enhancement requests.</p>
<h2>Things awaiting further attention</h2>
<ul>
<li>Support for BIG5 and ShiftJIS (Rick Jelliffe)</li>
<li>Stronger checking on which attributes appear on what
elements</li>
<li>Sorting attributes in a canonical order</li>
<li>Version checking for HTML 4.01 vs 4.0 (Tidy currently will
set the document type to 4.01 in preference to 4.0)</li>
<li>Noticing that the document isn't really XHTML if it isn't
wellformed, i.e. it lacks end tags and quotes on attribute
values</li>
<li>Converting &lt;font face="Symbol"&gt;a&lt;/font&gt; etc. to
the corresponding Unicode characters, when cleaning HTML.</li>
<li>link checking - this would involve some platform dependent
code as the network interface varies significantly from one
platform to the next.</li>
<li>When exporting Word2000 to Web page, there is a need for
smarter rules of thumb for working out whether the paragraph is a
bulletted or numbered list item, and determining the level of
nesting. Perhaps the style attribute holds the key? This tends to
include substrings like: "mso-list:l0 level1 lfo2;" and
"mso-list:l1 level1 lfo1;". Unfortunately, these aren't always
present, and I have yet to figure out a foolproof heuristic.</li>
</ul>
<p>I need to set up an index of precisely what attributes are
supported on each element. Right now, some elements check their
own attributes, whilst others are checked via default checks
defined for each attribute independently of the element. Until
this is done, you sometimes find that validation services
discovering errors unnoticed by Tidy itself.</p>
<p>Jelks Cabaniss asks: <i>Could Tidy be made to automatically
"clean" (FONTs to CSS) if the Strict DOCTYPE is requested? An
HTML or XHTML Strict document can't have FONT tags according to
the DTDs</i>. Jelks has a bunch of other good ideas such as
converting the bgcolor attribute over to CSS.</p>
<p>Adding an option to select slide transition effects. I would
also like to provide an optional feature for sorting attribute
values.</p>
<p>I am having problems with form elements as direct children of
tr or table. It is dangerous to create an implicit table cell,
and what is needed is a way to move the form element into the
next cell. If this can't be done an error needs to be raised
since Tidy will be stuck. On a separate note, Tidy is still
breaking lines between &lt;img&gt; and &lt;/a&gt; which in
Netscape shows as an underlined space. It's fine in IE.</p>
<p>Benjamin Holzman &lt;bah@orientation.com&gt; writes: I'm
wrapping tidy (release-date 2000.01.13) in some perl objects
(using SWIG), and CharEncoding being a global is a bit of a pain.
I was wondering what your thoughts would be on how to fix that.
The character encoding is already a property of struct Out; is
there any reason why making it part of struct StreamIn as well,
and perhaps setting that property in OpenInput, based on the
existing CharEncoding variable, wouldn't allow us to move
CharEncoding to be local to main?</p>
<p>Oh, in case you're curious about the API, here's a short
script using my wrappers to be an html to xhtml filter:</p>
<pre>
#!/usr/bin/perl
require tidy;
my $tidy = Tidy-&gt;new(*STDIN);
my $document = $tidy-&gt;parse;
$tidy-&gt;as_xhtml(*STDOUT);
</pre>
<p>Rick Parsons would like there to be a new wrap-attributes
option that can be used to suppress line wrapping within
attributes. There is already a similar option for JavaScript
literals.</p>
<p>Vijay Patil would like tidy -h to display options sorted
alphabetically.</p>
<p>Julian Reschke would like there to be an option to add the
xml:space="preserve" attribute to pre elements when outputting
xml.</p>
<p>Armando Asantos would like to use Tidy to produce a list of
URLs for images or hypertext links according to a config option.
This would be straightforward, but is a lower priority than bug
fixes etc.</p>
<p>Omri Traub would like an option to wrap the contents of style
and script elements in CDATA marked sections when converting to
XHTML. He is also interested in direct support for 16 bit
character file I/O.</p>
<p>Bertilo Wennergren notes:</p>
<blockquote>If I configure Tidy to "upgrade to style sheets", it
does so for a few things in my main document, but the code thus
created get error reports if I feed it back to Tidy. It turns out
that Tidy creates extra "class" attributes on tags that already
have "class" attributes set. This happens with this page:
&lt;http://www.concinnity.se/bertilow/index.htm&gt;.</blockquote>
<p>Randi Waki notes:</p>
<blockquote>
<p>If a quoted URL attribute value (e.g., href in &lt;a&gt;
elements) contains a line break, 13-Jan-2000 Tidy changes the
line break to a space while IE and Netscape discard the line
break. This can result in a broken link in the tidied
document.</p>
<p>I believe the following change fixes the problem. In lexer.c,
insert the following lines before line 2502:</p>
<pre>
/* discard line breaks in quoted URLs */
if (c == '\n' &amp;&amp; IsUrl(name))
continue;
/* existing line 2502 */ c = ' ';
</pre>
</blockquote>
<p>Stephen Reynolds would like Tidy to keep track of whether a
comment started on a new line and preserve this in the
output.</p>
<p>Terry Teague says:</p>
<blockquote>
<p>Sorry, I should have been more clear. Part of the problem is
the current HelpText() function in localize.c doesn't actually
reflect current reality.</p>
<p>You need to at least add the following line to HelpText()
:</p>
<pre>
tidy_out(out, " -version or -v show version\n");
</pre>
<p>And I suppose it should mention the use of the new
"--&lt;config options&gt;" type syntax.</p>
<p>Regards, Terry</p>
</blockquote>
<p>John Russel notes:</p>
<pre>
what i wonder is
1] does the specification indicate these are WRONG
2] if so why do they pass thru tidy ....
is url syntax such a can of worms that it is left to user
to check .......
CASE 1: misuse of slash for folders
site had background="pics\fancy.jpg"
instead of "pics/fancy.jpg"
CASE 2: spaces in filename
site had href="coin album.html"
instead of "coin%20album.html"
</pre>
<p>Andre Stechert would like a way to prevent Tidy from
"cleaning" newly declared elements which don't have any content
but do have end tags, see his mail of 17th January 2000</p>
<p>Todd Clark would like to use Tidy with Microsoft's WebClass
tags. Unfortunately these include unusual characters in the tag
names such as @ which Tidy objects to, for instance:</p>
<pre>
&lt;WC@DOMAINNAME&gt;test.com&lt;/WC@DOMAINNAME&gt;
</pre>
<p>Perhaps it makes sense to offer an option to make Tidy less
picky about what characters it accepts in tag names. Or perhaps
"WebClass: yes".</p>
<p>Jelks Cabaniss suggests an option to control dropping of empty
elements, e.g. according to what attributes they have.</p>
<p>Paavo Hartikainen writes:</p>
<blockquote>
<p>Tidy always expands '&amp;' to '&amp;' even if I have
'quote-ampersand: no' defined in configuration file. This is not
a good thing to do for URLs that have '&amp;' characters in them.
OS is Debian GNU/Linux 2.1 SPARC. Same thing happens on Alpha.
Other architectures I have not tried.</p>
<p>My configuration looks like this:</p>
<pre>
char-encoding: latin1
error-file: ./errors
indent-spaces: 2
logical-emphasis: yes
output-xhtml: yes
quiet: no
quote-ampersand: no
show-warnings: yes
tidy-mark: yes
wrap: 78
wrap-attributes: no
write-back: yes
keep-time: yes
</pre>
</blockquote>
<p>Paul White reports that Tidy isn't recognizing HTML 3.2 when
the doctype is "-//W3C//DTD HTML 3.2 Final//EN" (as per the REC),
and similarly for HTML 4.01. This would appear to call for a
change to the table of names in lexer.c.</p>
<p>Stuart Hungerford would like Tidy to detect and fix duplicate
attributes e.g. multiple class attributes. Celeste Suliin Burris
would like Tidy to replace spaces in URLs by %20 as some versions
of Netscape "croak big time" on this. Denis Kokarev also wants
Tidy to remove duplicate attributes when the values are the same.
This apparently stops XSLT from working. Brian Schweitzer notes
that Tidy adds a 2nd class attribute rather than merging the
classes into a space separated list.</p>
<p>Bertilo Wennergren writes: Tidy seems not to recognize frame
elements with a closing "/". It actually removes them. Try his <a
href="http://www.concinnity.se/bertilow/pmeg/pmeg9/k_bazo.htm">example</a>.
Tidy can produce XHTML Frameset docs, but when fed them back</p>
<p>again it cries foul.</p>
<p>Jose Manuel Cerqueira Esteves notes:</p>
<pre>
I've used `tidy' to convert a few HTML 4.0 files to XHTML 1.0 and noticed
a problem when dealing with constructs like
&lt;small&gt;&lt;small&gt;some text&lt;/small&gt;&lt;/small&gt;
First, `tidy' acts as if the second "&lt;small&gt;" was meant as a closing tag:
Warning: "&lt;small&gt; is probably intended as &lt;/small&gt;"
Then it trims the resulting empty &lt;small&gt;&lt;/small&gt;:
Warning: trimming empty &lt;small&gt;
And finally both remaining closing tags ("&lt;/small&gt;"), now spurious,
are removed:
Warning: discarding unexpected &lt;/small&gt;
Warning: discarding unexpected &lt;/small&gt;
It would be convenient to have at least some `tidy' option to prevent this
from happening (or perhaps some different heuristics?).
</pre>
<p>Robbert Hans Baron would like to see Tidy warning about
duplicate attributes and fixing these when the values are
identical.</p>
<p>Jutta Wrage notes that: When parsing HTML 3.2 Pages, tidy
doesn't accept textareas in forms correctly. The HTML Reference
specification (HTML 3.2 Final) allows: name, rows and cols, but
upon seeing these Tidy thinks the document is 4.0.</p>
<p>Matthew Brealey notes that a heading start tag is coerced to
an end heading tag when the end tag is missing. This is
deliberate, but perhaps not the best heuristic.</p>
<p>HIYAMA Masayuki notes that Tidy should set the encoding
attribute to match the language encoding, e.g. ?xml version="1.0"
encoding="iso-2022-jp"?&gt;&lt;.</p>
<p>Mark Modrall has extended Tidy to support selectively
stripping out listed tags and attributes, see his email of March
14th.</p>
<p>Yong Taek Bae notes that with the omit end tags option Tidy
omits the body tag even if it has attributes. This is an
error.</p>
<p>Tapio Markula reports that Tidy is incorrectly replacing
accented characters in script elements by entities. The script
element (in HTML but not XHTML) is CDATA and as such entities
won't be expanded. This bug needs to be fixed along with the
support for CDATA sections.</p>
<p>Terrill Bennett reports tidy crashing when producing slides,
and when the -i option has been set. He later added the crash
occurs when the page doesn't include an h1 element. See
Terrill-Bennett-11mar00.txt.</p>
<p>Stephen Lewis notes that if an &lt;hr&gt; element is present
in the head before the title element, then Tidy gets confused and
adds in a spurious extra empty title element. This would be
avoided if Tidy could move the hr into the body before the body
element is encountered. This raises a number of problems for
instance working out when to copy in attributes from an explicit
body element.</p>
<p>Carl Osterly would like Tidy to avoid breaking lines before or
after the = sign in attribute values when this is practical.
Perhaps a simple rule of thumb could be used to decide this?</p>
<p>Rick H Wesson notes that Tidy crashes on CDATA marked sections
when parsing XML.</p>
<p>Luigi Federici would like an option to set the DTD URI for XML
or XHTML.</p>
<p>Mat Sander notes: If I have php code the indentation behaves
strange. Repeated tidying php content and end tag indented one
level extra for each time. The result ends up something like
this:</p>
<pre>
...
&lt;?php
$r=0;
?&lt;
...
I have the fillowing config file for Tidy:
---
tidy-mark: no
markup: yes
wrap: 0
indent: auto
output-xml: no
output-xhtml: yes
doctype: loose
char-encoding: latin1
quote-marks: yes
assume-xml-procins: yes
word-2000: yes
clean: yes
logical-emphasis: yes
drop-empty-paras: yes
enclose-text: yes
fix-bad-comments: yes
alt-text: .
write-back: bool
keep-time: yes
show-warnings: no
quiet: yes
split: no
---
Best Regards,
Mats-Olof Sander
</pre>
<p>Don Hasson notes that if you make a mistake and leave off the
ending "/" in the &lt;title&gt; tag, tidy will generate an extra
set of &lt;title&gt;s.</p>
<p>Example:</p>
<pre>
&lt;html&gt;
&lt;head&gt;&lt;title&gt;No end here&lt;title&gt;&lt;/head&gt;
&lt;body&gt;
Empty
&lt;/body&gt;
&lt;/html&gt;
</pre>
<p>produces this:</p>
<pre>
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;No end here&lt;/title&gt;
&lt;title&gt;&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
Empty
&lt;/body&gt;
&lt;/html&gt;
</pre>
<p>Jeff Wilkinson would like the HTML Tidy page to include
internal anchors so that he can link directly to the appropriate
sections.</p>
<p>Peter Vince would like to be able to clean presentation
attributes on the body element, as well as translating b and i to
span.</p>
<p>Dave Bryan and Mathew Brealey would like there to be a way to
suppress the default handling of inline elements in favor of
simply inserting the appropriate end tag when encountering an
element that isn't allowed in an inline context. The default
behavior replicates the rendering on existing browsers but can
cause problems for hand editors.</p>
<p>Dave Bryan notes that tidy isn't updating the column position
when parsing attributes.</p>
<p>Can Tidy track when a line break occurs after a PI or comment
and reproduce this in the output? This idea occurred to me after
reading a comment from Brad Stowers.</p>
<p>One interesting suggestion is to make some of Tidy's rules of
thumb sensitive to the program that generated the markup as
indicated by the meta element. This would allow for greater
robustness in how the rules operate.</p>
<p>Dave Bryan would like the quiet mode to be tweaked to suppress
the general info at the end of the report. see
Dave-Bryan-24mar00.txt.</p>
<p>Erik Rossen would like an option to suppress line wrap within
tags, so that the tag is always on the same line regardless of
the number and length of the attributes.</p>
<p>Dan Satria suggest that the clean mechanism check to see if
there are any existing matching style rules before adding new
ones.</p>
<p>Zoltan Hawryluk suggests mapping the Netscape layer tag into
the equivalent CSS positioning syntax.</p>
<p>Jim Walker says Tidy doesn't correctly report errors such as
<tt>&lt;/&lt;/head&gt;</tt>.</p>
<p>Tidy's slide feature: see Johannes-Poutre-12jul00.txt</p>
<p>Carole Mah suggests Tidy should recover from multiple class
attributes on the same element.</p>
<h2>Other ideas</h2>
<ul>
<li>Recursion through subdirectories, so you can fix up your
entire web site at one go. This assumes I can find a way that is
portable across a wide range of platforms!</li>
<li>Support for W3C's <a
href="http://www.w3.org/TR/REC-DOM-Level-1/">Document Object
Model</a> (DOM) level one.</li>
<li>Full validation of all attribute values.</li>
<li>Mapping Unicode bidi control characters to HTML tags.</li>
<li>Full support for parsing XML (still somewhat limited).</li>
<li>How to say which XML elements should be printed
"inline".</li>
<li>Acting on the XML encoding attribute, e.g.
&lt;?xml&#160;encoding="iso-8859-1"&gt;</li>
<li>Improved mapping from HTML presentation attributes/elements
to CSS.</li>
<li>Improved support for <a
href="http://java.sun.com/products/jsp/">JSP</a> (Java Server
pages)</li>
<li>Ugly print option which removes all optional whitespace</li>
</ul>
</body>
</html>

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<!doctype html>
<meta charset=utf-8>
<title>HTML Tidy for HTML5 (experimental)</title>
<style type="text/css">
html {
background: #DDE5D9 url(data:image/gif;base64,R0lGODlhBAAEAIAAANra2v///yH5BAAAAAAALAAAAAAEAAQAAAIFTGB4xlcAOw==) repeat 0 0;
font-family: "Lucida Sans Unicode", "Lucida Sans", verdana, arial, helvetica;
}
body {
border: solid 1px #CED4CA;
background-color: #FFF;
padding: 4px 40px 40px 40px;
margin: 20px 20px 20px 20px;
padding-right: 20%;
}
h1, h2 {
color: #0B5B9D;
}
h1 {
font-size: 39px;
font-weight: normal;
vertical-align: top;
margin-bottom: 0px;
}
a {
text-decoration: none;
color: #0B5B9D;
padding: 2px;
}
a:hover {
text-decoration: none;
background-color: #0B5B9D;
color: white;
}
a:active {
text-decoration: none;
background-color: white;
color: black;
}
#toc {
position: fixed;
top: 10px;
right: 10px;
border: 2px solid #0B5B9D;
background: rgba(255,255,255,.9);
padding: 15px;
z-index: 999;
max-height: 400px;
overflow: auto;
font-size: 11px;
font-family: Verdana, sans-serif;
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#toc-button {
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#toc .button,
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margin: 0 0 5px 5px;
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background-color:#ccf;
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#toc ol {
margin: 0;
padding: 0;
font-size: 11px;
font-family: Verdana, sans-serif;
}
#toc li {
list-style: decimal outside;
margin-left: 20px;
font-size: 11px;
font-family: Verdana, sans-serif;
}
#toc li a {
font-size: 11px;
font-family: Verdana, sans-serif;
}
.hide {
display: none;
}
.show {
display: block;
}
code { color: green; font-weight: bold; }
pre { color: green; font-weight: bold; font-family: monospace}
em { font-style: italic; color: rgb(0, 0, 153) }
:link { color: rgb(0, 0, 153) }
:visited { color: rgb(153, 0, 153) }
</style>
<h1 id=intro>HTML Tidy for HTML5 (experimental)</h1>
<p>This page documents the experimental HTML5 fork of HTML Tidy available
at
<a href="https://github.com/w3c/tidy-html5">https://github.com/w3c/tidy-html5</a>.
<p>File bug reports and enhancement requests at
<a href="https://github.com/w3c/tidy-html5/issues">https://github.com/w3c/tidy-html5/issues</a>.</p>
<p>The W3C public mailing list for HTML Tidy discussion is
<b>html-tidy@w3.org</b> (<a href= "http://lists.w3.org/Archives/Public/html-tidy/">list archive</a>).
<p>For more information on HTML5:</p>
<ul>
<li>
<a href="http://dev.w3.org/html5/spec-author-view">HTML: Edition for Web Authors</a> (the latest HTML specification)
<li>
<a href="http://dev.w3.org/html5/markup/">HTML: The Markup Language</a> (an HTML language reference)
</ul>
<p>
Validate your HTML documents using the
<a href="http://validator.w3.org/nu/">W3C Nu Markup Validator</a>.
<h2 id=what-tidy-does>What Tidy does</h2>
<p>Tidy corrects and cleans up HTML content by fixing markup errors.
Here are a few examples:
<ul>
<li><b>Mismatched end tags:</b>
<pre>
&lt;h2&gt;subheading&lt;/h3&gt;
</pre>
<p>…is converted to:</p>
<pre>
&lt;h2&gt;subheading&lt;/h2&gt;
</pre></li>
<li><b>Misnested tags:</b>
<pre>
&lt;p&gt;here is a para &lt;b&gt;bold &lt;i&gt;bold italic&lt;/b&gt; bold?&lt;/i&gt; normal?
</pre>
<p>…is converted to:</p>
<pre>
&lt;p&gt;here is a para &lt;b&gt;bold &lt;i&gt;bold italic&lt;/i&gt; bold?&lt;/b&gt; normal?
</pre></li>
<li><b>Missing end tags:</b>
<pre>
&lt;h1&gt;heading
&lt;h2&gt;subheading&lt;/h2&gt;
</pre>
<p>…is converted to:</p>
<pre>
&lt;h1&gt;heading&lt;/h1&gt;
&lt;h2&gt;subheading&lt;/h2&gt;
</pre>
…and
<pre>
&lt;h1&gt;&lt;i&gt;italic heading&lt;/h1&gt;
</pre>
<p>…is converted to:</p>
<pre>
&lt;h1&gt;&lt;i&gt;italic heading&lt;/i&gt;&lt;/h1&gt;
</pre></li>
<li><b>Mixed-up tags</b>
<pre>
&lt;i&gt;&lt;h1&gt;heading&lt;/h1&gt;&lt;/i&gt;
&lt;p&gt;new paragraph &lt;b&gt;bold text
&lt;p&gt;some more bold text
</pre>
<p>…is converted to:</p>
<pre>
&lt;h1&gt;&lt;i&gt;heading&lt;/i&gt;&lt;/h1&gt;
&lt;p&gt;new paragraph &lt;b&gt;bold text&lt;/b&gt;
&lt;p&gt;&lt;b&gt;some more bold text&lt;/b&gt;
</pre></li>
<li><b>Tag in the wrong place:</b>
<pre>
&lt;h1&gt;&lt;hr&gt;heading&lt;/h1&gt;
&lt;h2&gt;sub&lt;hr&gt;heading&lt;/h2&gt;
</pre>
<p>…is converted to:</p>
<pre>
&lt;hr&gt;
&lt;h1&gt;heading&lt;/h1&gt;
&lt;h2&gt;sub&lt;/h2&gt;
&lt;hr&gt;
&lt;h2&gt;heading&lt;/h2&gt;
</pre></li>
<li><b>Missing "/" in end tags:</b>
<pre>
&lt;a href="#refs"&gt;References&lt;a&gt;
</pre>
<p>…is converted to:</p>
<pre>
&lt;a href="#refs"&gt;References&lt;/a&gt;
</pre></li>
<li><b>List markup with missing tags:</b>
<pre>
&lt;body&gt;
&lt;li&gt;1st list item
&lt;li&gt;2nd list item
</pre>
<p>…is converted to:</p>
<pre>
&lt;body&gt;
&lt;ul&gt;
&lt;li&gt;1st list item&lt;/li&gt;
&lt;li&gt;2nd list item&lt;/li&gt;
&lt;/ul&gt;
</pre></li>
<li><b>Missing quotation marks around attribute values</b>
<p>Tidy inserts quotation marks around all attribute values for you. It
can also detect when you have forgotten the closing quotation mark,
although this is something you will have to fix yourself.</p>
</li>
<li><b>Unknown/proprietary attributes</b>
<p>Tidy has a comprehensive knowledge of the attributes defined in HTML5.
That often allows you to spot where you have mis-typed an attribute.
</li>
<li><b>Tags lacking a terminating "&gt;"</b>
<p>This is something you then have to fix yourself as Tidy cannot
determine where the "&gt;" was meant to be inserted.</p>
</li>
</ul>
<h2 id="help">How to run Tidy from the command line</h2>
<p>This is the syntax for invoking Tidy from the command line:
<pre>
<code>tidy <em>[[options] filename]*</em></code>
</pre>
<p>
Tidy defaults to reading from standard input, so if you run Tidy without
specifying the <code><em>filename</em></code> argument, it will just sit
there waiting for input to read.
And Tidy defaults to writing to standard output. So you can pipe output
from Tidy to other programs, as well as pipe output from other programs to
Tidy. You can page through the output from Tidy by piping it to a pager:</p>
<pre>
tidy file.html | less
</pre>
<p>
To have Tidy write its output to a file instead, either use the
<code>-o <em>filename</em></code> or <code>-output <em>filename</em></code>
option, or redirect standard output to the file; for example:
<pre>
tidy -o output.html index.html
tidy index.html > output.html
</pre>
<p>Both of those run tidy on the file <b>index.html</b> and write the
output to the file <b>output.html</b>, while writing any error messages to
standard error.
<p>
Tidy defaults to writing its error messages to standard error (that is, to
the console where youre running Tidy). To page through the error messages,
along with the output, redirect standard error to standard output, and pipe
it to your pager:
<pre>
tidy index.html 2&gt;&amp;1 | less
</pre>
<p>
To have Tidy write the errors to a file instead, either use the
<code>-f <em>filename</em></code> or <code>-file <em>filename</em></code>
option, or redirect standard error to a file:</p>
<pre>
tidy -o output.html -f errs.txt index.html
tidy index.html > output.html 2> errs.txt
</pre>
<p>Both of those run tidy on the file <b>index.html</b> and write the
output to the file <b>output.html</b>, while writing any error messages to
the file <b>errs.txt</b>.
<p>
Writing the error messages to a file is especially useful if the file you
are checking has many errors; reading them from a file instead of the
console or pager can make it easier to review them.
<p>You can use the or <code>-m</code> or <code>-modify</code> option to
modify (in-place) the contents of the input file you are checking; that is,
to overwrite those contents with the output from Tidy. Example:
<pre>
tidy -f errs.txt -m index.html
</pre>
<p>That runs tidy on the file <b>index.html</b>, modifying it in place
and writing the error messages to the file <b>errs.txt</b>.
<p>
<b>Caution:</b> If you use the -m option, you should first save a copy of your file.
<h2 id=options>Options and configuration settings</h2>
<p>To get a list of available options, use:</p>
<pre>
tidy -help
</pre>
<p>To get a list of all configuration settings, use:</p>
<pre>
tidy -help-config
</pre>
<p>To read the help output a page at time, pipe it to a pager:
<pre>
tidy -help | less
tidy -help-config | less
</pre>
<p>Single-letter options other than -f may be combined; for example:
<pre>
tidy -f errs.txt -imu foo.html
</pre>
<h2 id="config">Using a config file</h2>
<p>The most convenient way to configure Tidy is by using separate
config file.
Assuming you have created a
Tidy config file named <b>config.txt</b> (the name doesn't matter), you can
instruct Tidy to use it via the command line option
<code>-config config.txt</code>; for example:
<pre>
tidy -config config.txt file1.html file2.html
</pre>
<p>Alternatively, you can name the default config file via the
environment variable named <b>HTML_TIDY</b>, the value of which is
the absolute path for the config file.
<p>You can also set config options on the command line by preceding
the name of the option immediately (no intervening space) with the string "<code>--</code>";
for example:</p>
<pre>
tidy --break-before-br true --show-warnings false
</pre>
<p>You can find documentation for full set of configuration options
on the
<a href= "quickref.html">Quick Reference</a>
page.
<h2 id=sample-config>Sample config file</h2>
<p>The following is an example of a Tidy config file.</p>
<pre>
// sample config file for HTML tidy
indent: auto
indent-spaces: 2
wrap: 72
markup: yes
output-xml: no
input-xml: no
show-warnings: yes
numeric-entities: yes
quote-marks: yes
quote-nbsp: yes
quote-ampersand: no
break-before-br: no
uppercase-tags: no
uppercase-attributes: no
char-encoding: latin1
new-inline-tags: cfif, cfelse, math, mroot,
mrow, mi, mn, mo, msqrt, mfrac, msubsup, munderover,
munder, mover, mmultiscripts, msup, msub, mtext,
mprescripts, mtable, mtr, mtd, mth
new-blocklevel-tags: cfoutput, cfquery
new-empty-tags: cfelse
</pre>
<h2 id=indenting>Indenting output for readability</h2>
<p>Indenting the source markup of an HTML document makes the markup easier
to read. Tidy can indent the markup for an HTML document while recognizing
elements whose contents should not be indented. In the example below, Tidy
indents the output while preserving the formatting of the &lt;pre>
element:</p>
<p>Input:</p>
<pre>
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;Test document&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;p&gt;This example shows how Tidy can indent output while preserving
formatting of particular elements.&lt;/p&gt;
&lt;pre&gt;This is
&lt;em&gt;genuine
preformatted&lt;/em&gt;
text
&lt;/pre&gt;
&lt;/body&gt;
&lt;/html&gt;
</pre>
<p>Output:</p>
<pre>
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;Test document&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;p&gt;This example shows how Tidy can indent output while preserving
formatting of particular elements.&lt;/p&gt;
&lt;pre&gt;
This is
&lt;em&gt;genuine
preformatted&lt;/em&gt;
text
&lt;/pre&gt;
&lt;/body&gt;
&lt;/html&gt;
</pre>
<p>Tidys indenting behavior is not perfect and can sometimes cause your
output to be rendered by browsers in a different way than the input.
You can avoid unexpected indenting-related rendering problems by setting
<code>indent: no</code> or <code>indent: auto</code> in a config file.</p>
<h2 id=preserve-indenting>Preserving original indenting not possible</h2>
<p>Tidy is not capable of preserving the original indenting of the markup
from the input it receives. Thats because Tidy starts by building a clean
parse tree from the input, and that parse tree doesnt contain any
information about the original indenting. Tidy then pretty-prints the parse
tree using the current config settings. Trying to preserve the original
indenting from the input would interact badly with the repair operations
needed to build a clean parse tree, and would considerably complicate the
code.</p>
<h2 id=encodings>Encodings and character references</h2>
<p>
Tidy defaults to assuming you want output to be encoded in UTF-8.
But Tidy offers you a choice of other character encodings: US ASCII, ISO
Latin-1, and the ISO 2022 family of 7 bit encodings.
<p>
Tidy doesn't yet recognize the use of the HTML &lt;meta> element for
specifying the character encoding.</p>
<p>
The full set of HTML character references are defined. Cleaned-up output
uses named character references for characters when appropriate. Otherwise,
characters outside the normal range are output as numeric character
references.
<h2 id=accessibility>Accessibility</h2>
<p>Tidy offers advice on potential accessibility problems for people using
non-graphical browsers.
<h2 id=presentational-markup>Cleaning up presentational markup</h2>
<p>Some tools generate HTML with presentational elements such as &lt;font>,
&lt;nobr>, and &lt;center>.
Tidy's <code>-clean</code> option will replace those elements with CSS style
properties.
<p>Some HTML documents rely on the presentational effects of &lt;p&gt; start
tags that are not followed by any content. Tidy deletes such &lt;p> tags
(as well as any headings that dont have content). So do not use &lt;p>
tags simply for adding vertical whitespace; instead use CSS, or the
&lt;br&gt; element. However, note that Tidy wont discard &lt;p> tags that
are followed by any nonbreaking space (that is, the &amp;nbsp; named
character reference).
<h2 id=new-tags>Teaching Tidy about new tags</h2>
<p>You can teach Tidy about new tags by declaring them in the
configuration file, the syntax is:</p>
<pre>
new-inline-tags: <em>tag1, tag2, tag3</em>
new-empty-tags: <em>tag1, tag2, tag3</em>
new-blocklevel-tags: <em>tag1, tag2, tag3</em>
new-pre-tags: <em>tag1, tag2, tag3</em>
</pre>
<p>The same tag can be defined as empty and as inline or as empty
and as block.</p>
<p>These declarations can be combined to define a new empty
inline or empty block element. But you are not advised to declare
tags as being both inline and block.</p>
<p>Note that the new tags can only appear where Tidy expects inline
or block-level tags respectively. That means you cant place
new tags within the document head or other contexts with restricted
content models.
<h2 id=php-asp-jste>Ignoring PHP, ASP, and JSTE instructions</h2>
<p>Tidy will gracefully ignore many cases of PHP, ASP, and JSTE
instructions within element content and as replacements for attributes,
and preserve them as-is in output; for example:</p>
<pre>
&lt;option &lt;% if rsSchool.Fields("ID").Value
= session("sessSchoolID")
then Response.Write("selected") %&gt;
value='&lt;%=rsSchool.Fields("ID").Value%&gt;'&gt;
&lt;%=rsSchool.Fields("Name").Value%&gt;
(&lt;%=rsSchool.Fields("ID").Value%&gt;)
&lt;/option&gt;
</pre>
<p>But note that Tidy may report missing attributes when those are “hidden”
within the PHP, ASP, or JSTE code. If you use PHP, ASP, or JSTE code to
create a start tag, but place the end tag explicitly in the HTML markup, Tidy
wont be able to match them up, and will delete the end tag. So in that
case you are advised to make the start tag explicit and to use PHP, ASP, or
JSTE code for just the attributes; for example:</p>
<pre>
&lt;a href="&lt;%=random.site()%&gt;"&gt;do you feel lucky?&lt;/a&gt;
</pre>
<p>
Tidy can also get things wrong if the PHP, ASP, or JSTE code includes
quotation marks; for example:
</p>
<pre>
value="&lt;%=rsSchool.Fields("ID").Value%&gt;"
</pre>
<p>Tidy will see the quotation mark preceding <i>ID</i> as ending the
attribute value, and proceed to complain about what follows.
<p>Tidy allows you to control whether line wrapping on spaces within
PHP, ASP, and JSTE
instructions is enabled; see the <b>wrap-php</b>, <b>wrap-asp</b>,
and <b>wrap-jste</b> config options.</p>
<h2 id=xml>Correcting well-formedness errors in XML markup</h2>
<p>Tidy can help you to correct well-formedness errors in XML markup. Tidy
doesn't yet recognize all XML features, though; for example, it doesn't
understand CDATA sections or DTD subsets.</p>
<h2 id="scripts">Using Tidy from scripts</h2>
<p>If you want to run Tidy from a Perl or other scripting language
you may find it of value to inspect the result returned by Tidy
when it exits: 0 if everything is fine, 1 if there were warnings
and 2 if there were errors. This is an example using Perl:</p>
<pre>
if (close(TIDY) == 0) {
my $exitcode = $? &gt;&gt; 8;
if ($exitcode == 1) {
printf STDERR "tidy issued warning messages\n";
} elsif ($exitcode == 2) {
printf STDERR "tidy issued error messages\n";
} else {
die "tidy exited with code: $exitcode\n";
}
} else {
printf STDERR "tidy detected no errors\n";
}
</pre>
<h2 id="implementation">Source code</h2>
<p>The source code for the experimental HTML5 fork of Tidy can be found at
<a href="https://github.com/w3c/tidy-html5">https://github.com/w3c/tidy-html5</a>.
<h2 id=acks>Acknowledgements</h2>
<p>Dave Raggett has a list of
<a href="http://www.w3.org/People/Raggett/tidy/#acks">Acknowledgements</a>
for people who made suggestions or reported bugs for the
original version of Tidy.
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<ol>
<li><a href="#what-tidy-does">What Tidy does</a>
<li><a href="#help">How to run Tidy from the command line</a>
<li><a href="#options">Options and configuration settings</a>
<li><a href="#config">Using a config file</a>
<li><a href="#sample-config">Sample config file</a>
<li><a href="#indenting">Indenting output for readability</a>
<li><a href="#preserve-indenting">Preserving original indenting not possible</a>
<li><a href="#encodings">Encodings and character references</a>
<li><a href="#accessibility">Accessibility</a>
<li><a href="#presentational-markup">Cleaning up presentational markup</a>
<li><a href="#new-tags">Teaching Tidy about new tags</a>
<li><a href="#php-asp-jste">Ignoring PHP, ASP, and JSTE instructions</a>
<li><a href="#xml">Correcting well-formedness errors in XML markup</a>
<li><a href="#scripts">Using Tidy from scripts</a>
<li><a href="#implementation">Source code</a>
<li><a href="#acks">Acknowledgements</a>
</ol>
</div>