628 lines
21 KiB
HTML
628 lines
21 KiB
HTML
<!doctype html>
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<meta charset=utf-8>
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<title>HTML Tidy for HTML5 (experimental)</title>
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<style type="text/css">
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html {
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background: #DDE5D9 url(data:image/gif;base64,R0lGODlhBAAEAIAAANra2v///yH5BAAAAAAALAAAAAAEAAQAAAIFTGB4xlcAOw==) repeat 0 0;
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font-family: "Lucida Sans Unicode", "Lucida Sans", verdana, arial, helvetica;
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}
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body {
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border: solid 1px #CED4CA;
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background-color: #FFF;
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padding: 4px 40px 40px 40px;
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margin: 20px 20px 20px 20px;
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padding-right: 20%;
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}
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h1, h2 {
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color: #0B5B9D;
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}
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h1 {
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font-size: 39px;
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font-weight: normal;
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vertical-align: top;
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margin-bottom: 0px;
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}
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a {
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text-decoration: none;
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color: #0B5B9D;
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padding: 2px;
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}
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a:hover {
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text-decoration: none;
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background-color: #0B5B9D;
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color: white;
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}
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a:active {
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text-decoration: none;
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background-color: white;
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color: black;
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}
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#toc {
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position: fixed;
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top: 10px;
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right: 10px;
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border: 2px solid #0B5B9D;
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background: rgba(255,255,255,.9);
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padding: 15px;
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z-index: 999;
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max-height: 400px;
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overflow: auto;
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font-size: 11px;
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font-family: Verdana, sans-serif;
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}
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#toc-button {
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position: fixed;
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top: 10px;
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right: 10px;
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background: transparent;
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padding: 15px;
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z-index: 999;
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max-height: 400px;
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overflow: auto;
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font-size: 11px;
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font-family: Verdana, sans-serif;
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}
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#toc .button,
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#toc-button .button,
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#quickref-button .button {
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float: right;
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width: 59px;
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text-align: center;
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margin: 0 0 5px 5px;
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padding: 5px;
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border: 1px #008 solid;
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color:#00f;
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background-color:#ccf;
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}
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#toc ol {
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margin: 0;
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padding: 0;
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font-size: 11px;
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font-family: Verdana, sans-serif;
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}
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#toc li {
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list-style: decimal outside;
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margin-left: 20px;
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font-size: 11px;
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font-family: Verdana, sans-serif;
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}
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#toc li a {
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font-size: 11px;
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font-family: Verdana, sans-serif;
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}
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.hide {
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display: none;
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}
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.show {
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display: block;
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}
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#quickref-button {
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position: fixed;
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top: 40px;
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right: 10px;
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background: transparent;
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padding: 15px;
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z-index: 999;
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max-height: 400px;
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overflow: auto;
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font-size: 11px;
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font-family: Verdana, sans-serif;
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}
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code { color: green; font-weight: bold; }
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pre { color: green; font-weight: bold; font-family: monospace}
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em { font-style: italic; color: rgb(0, 0, 153) }
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:link { color: rgb(0, 0, 153) }
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:visited { color: rgb(153, 0, 153) }
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</style>
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<h1 id=intro>HTML Tidy for HTML5 (experimental)</h1>
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<p>This page documents the experimental HTML5 fork of HTML Tidy available
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at
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<a href="https://github.com/w3c/tidy-html5">https://github.com/w3c/tidy-html5</a>.
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<p>File bug reports and enhancement requests at
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<a href="https://github.com/w3c/tidy-html5/issues">https://github.com/w3c/tidy-html5/issues</a>.</p>
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<p>The W3C public mailing list for HTML Tidy discussion is
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<b>html-tidy@w3.org</b> (<a href= "http://lists.w3.org/Archives/Public/html-tidy/">list archive</a>).
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<p>For more information on HTML5:</p>
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<ul>
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<li>
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<a href="http://dev.w3.org/html5/spec-author-view">HTML: Edition for Web Authors</a> (the latest HTML specification)
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<li>
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<a href="http://dev.w3.org/html5/markup/">HTML: The Markup Language</a> (an HTML language reference)
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</ul>
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<p>
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Validate your HTML documents using the
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<a href="http://validator.w3.org/nu/">W3C Nu Markup Validator</a>.
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<h2 id=what-tidy-does>What Tidy does</h2>
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<p>Tidy corrects and cleans up HTML content by fixing markup errors.
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Here are a few examples:
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<ul>
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<li><b>Mismatched end tags:</b>
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<pre>
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<h2>subheading</h3>
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</pre>
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<p>…is converted to:</p>
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<pre>
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<h2>subheading</h2>
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</pre></li>
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<li><b>Misnested tags:</b>
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<pre>
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<p>here is a para <b>bold <i>bold italic</b> bold?</i> normal?
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</pre>
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<p>…is converted to:</p>
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<pre>
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<p>here is a para <b>bold <i>bold italic</i> bold?</b> normal?
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</pre></li>
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<li><b>Missing end tags:</b>
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<pre>
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<h1>heading
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<h2>subheading</h2>
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</pre>
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<p>…is converted to:</p>
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<pre>
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<h1>heading</h1>
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<h2>subheading</h2>
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</pre>
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…and
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<pre>
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<h1><i>italic heading</h1>
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</pre>
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<p>…is converted to:</p>
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<pre>
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<h1><i>italic heading</i></h1>
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</pre></li>
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<li><b>Mixed-up tags</b>
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<pre>
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<i><h1>heading</h1></i>
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<p>new paragraph <b>bold text
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<p>some more bold text
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</pre>
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<p>…is converted to:</p>
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<pre>
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<h1><i>heading</i></h1>
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<p>new paragraph <b>bold text</b>
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<p><b>some more bold text</b>
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</pre></li>
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<li><b>Tag in the wrong place:</b>
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<pre>
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<h1><hr>heading</h1>
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<h2>sub<hr>heading</h2>
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</pre>
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<p>…is converted to:</p>
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<pre>
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<hr>
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<h1>heading</h1>
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<h2>sub</h2>
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<hr>
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<h2>heading</h2>
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</pre></li>
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<li><b>Missing "/" in end tags:</b>
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<pre>
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<a href="#refs">References<a>
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</pre>
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<p>…is converted to:</p>
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<pre>
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<a href="#refs">References</a>
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</pre></li>
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<li><b>List markup with missing tags:</b>
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<pre>
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<body>
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<li>1st list item
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<li>2nd list item
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</pre>
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<p>…is converted to:</p>
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<pre>
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<body>
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<ul>
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<li>1st list item</li>
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<li>2nd list item</li>
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</ul>
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</pre></li>
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<li><b>Missing quotation marks around attribute values</b>
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<p>Tidy inserts quotation marks around all attribute values for you. It
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can also detect when you have forgotten the closing quotation mark,
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although this is something you will have to fix yourself.</p>
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</li>
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<li><b>Unknown/proprietary attributes</b>
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<p>Tidy has a comprehensive knowledge of the attributes defined in HTML5.
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That often allows you to spot where you have mis-typed an attribute.
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</li>
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<li><b>Tags lacking a terminating ">"</b>
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<p>This is something you then have to fix yourself as Tidy cannot
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determine where the ">" was meant to be inserted.</p>
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</li>
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</ul>
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<h2 id="help">How to run Tidy from the command line</h2>
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<p>This is the syntax for invoking Tidy from the command line:
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<pre>
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<code>tidy <em>[[options] filename]*</em></code>
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</pre>
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<p>
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Tidy defaults to reading from standard input, so if you run Tidy without
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specifying the <code><em>filename</em></code> argument, it will just sit
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there waiting for input to read.
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And Tidy defaults to writing to standard output. So you can pipe output
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from Tidy to other programs, as well as pipe output from other programs to
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Tidy. You can page through the output from Tidy by piping it to a pager:</p>
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<pre>
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tidy file.html | less
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</pre>
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<p>
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To have Tidy write its output to a file instead, either use the
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<code>-o <em>filename</em></code> or <code>-output <em>filename</em></code>
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option, or redirect standard output to the file; for example:
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<pre>
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tidy -o output.html index.html
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tidy index.html > output.html
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</pre>
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<p>Both of those run tidy on the file <b>index.html</b> and write the
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output to the file <b>output.html</b>, while writing any error messages to
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standard error.
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<p>
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Tidy defaults to writing its error messages to standard error (that is, to
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the console where you’re running Tidy). To page through the error messages,
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along with the output, redirect standard error to standard output, and pipe
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it to your pager:
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<pre>
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tidy index.html 2>&1 | less
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</pre>
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<p>
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To have Tidy write the errors to a file instead, either use the
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<code>-f <em>filename</em></code> or <code>-file <em>filename</em></code>
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option, or redirect standard error to a file:</p>
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<pre>
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tidy -o output.html -f errs.txt index.html
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tidy index.html > output.html 2> errs.txt
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</pre>
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<p>Both of those run tidy on the file <b>index.html</b> and write the
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output to the file <b>output.html</b>, while writing any error messages to
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the file <b>errs.txt</b>.
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<p>
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Writing the error messages to a file is especially useful if the file you
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are checking has many errors; reading them from a file instead of the
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console or pager can make it easier to review them.
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<p>You can use the or <code>-m</code> or <code>-modify</code> option to
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modify (in-place) the contents of the input file you are checking; that is,
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to overwrite those contents with the output from Tidy. Example:
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<pre>
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tidy -f errs.txt -m index.html
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</pre>
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<p>That runs tidy on the file <b>index.html</b>, modifying it in place
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and writing the error messages to the file <b>errs.txt</b>.
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<p>
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<b>Caution:</b> If you use the -m option, you should first save a copy of your file.
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<h2 id=options>Options and configuration settings</h2>
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<p>To get a list of available options, use:</p>
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<pre>
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tidy -help
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</pre>
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<p>To get a list of all configuration settings, use:</p>
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<pre>
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tidy -help-config
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</pre>
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<p>To read the help output a page at time, pipe it to a pager:
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<pre>
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tidy -help | less
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tidy -help-config | less
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</pre>
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<p>Single-letter options other than -f may be combined; for example:
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<pre>
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tidy -f errs.txt -imu foo.html
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</pre>
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<h2 id="config">Using a config file</h2>
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<p>The most convenient way to configure Tidy is by using separate
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config file.
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Assuming you have created a
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Tidy config file named <b>config.txt</b> (the name doesn't matter), you can
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instruct Tidy to use it via the command line option
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<code>-config config.txt</code>; for example:
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<pre>
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tidy -config config.txt file1.html file2.html
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</pre>
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<p>Alternatively, you can name the default config file via the
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environment variable named <b>HTML_TIDY</b>, the value of which is
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the absolute path for the config file.
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<p>You can also set config options on the command line by preceding
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the name of the option immediately (no intervening space) with the string "<code>--</code>";
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for example:</p>
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<pre>
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tidy --break-before-br true --show-warnings false
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</pre>
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<p>You can find documentation for full set of configuration options
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on the
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<a href= "quickref.html">Quick Reference</a>
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page.
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<h2 id=sample-config>Sample config file</h2>
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<p>The following is an example of a Tidy config file.</p>
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<pre>
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// sample config file for HTML tidy
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indent: auto
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indent-spaces: 2
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wrap: 72
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markup: yes
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output-xml: no
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input-xml: no
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show-warnings: yes
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numeric-entities: yes
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quote-marks: yes
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quote-nbsp: yes
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quote-ampersand: no
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break-before-br: no
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uppercase-tags: no
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uppercase-attributes: no
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char-encoding: latin1
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new-inline-tags: cfif, cfelse, math, mroot,
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mrow, mi, mn, mo, msqrt, mfrac, msubsup, munderover,
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munder, mover, mmultiscripts, msup, msub, mtext,
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mprescripts, mtable, mtr, mtd, mth
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new-blocklevel-tags: cfoutput, cfquery
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new-empty-tags: cfelse
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</pre>
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<h2 id="new-config">New configuration options</h2>
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<p>The experimental HTML5-aware fork of Tidy adds the following new
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configuration options:
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<ul>
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<li><a href="http://w3c.github.com/tidy-html5/quickref.html#coerce-endtags">coerce-endtags</a>
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<li><a href="http://w3c.github.com/tidy-html5/quickref.html#drop-empty-elements">drop-empty-elements</a>
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<li><a href="http://w3c.github.com/tidy-html5/quickref.html#merge-emphasis">merge-emphasis</a>
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<li><a href="http://w3c.github.com/tidy-html5/quickref.html#omit-optional-tags">omit-optional-tags</a>
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</ul>
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<p>In addition, it also adds a new <code>html5</code> value for the
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<a href="http://w3c.github.com/tidy-html5/quickref.html#doctype">doctype</a>
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configuration option.
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<h2 id=indenting>Indenting output for readability</h2>
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<p>Indenting the source markup of an HTML document makes the markup easier
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to read. Tidy can indent the markup for an HTML document while recognizing
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elements whose contents should not be indented. In the example below, Tidy
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indents the output while preserving the formatting of the <pre>
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element:</p>
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<p>Input:</p>
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<pre>
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<html>
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<head>
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<title>Test document</title>
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</head>
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<body>
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<p>This example shows how Tidy can indent output while preserving
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formatting of particular elements.</p>
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<pre>This is
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<em>genuine
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preformatted</em>
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text
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</pre>
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</body>
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</html>
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</pre>
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<p>Output:</p>
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<pre>
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<html>
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<head>
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<title>Test document</title>
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</head>
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<body>
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<p>This example shows how Tidy can indent output while preserving
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formatting of particular elements.</p>
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<pre>
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This is
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<em>genuine
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preformatted</em>
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text
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</pre>
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</body>
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</html>
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</pre>
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<p>Tidy’s indenting behavior is not perfect and can sometimes cause your
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output to be rendered by browsers in a different way than the input.
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You can avoid unexpected indenting-related rendering problems by setting
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<code>indent: no</code> or <code>indent: auto</code> in a config file.</p>
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<h2 id=preserve-indenting>Preserving original indenting not possible</h2>
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<p>Tidy is not capable of preserving the original indenting of the markup
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from the input it receives. That’s because Tidy starts by building a clean
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parse tree from the input, and that parse tree doesn’t contain any
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information about the original indenting. Tidy then pretty-prints the parse
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tree using the current config settings. Trying to preserve the original
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indenting from the input would interact badly with the repair operations
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needed to build a clean parse tree, and would considerably complicate the
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code.</p>
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<h2 id=encodings>Encodings and character references</h2>
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<p>
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Tidy defaults to assuming you want output to be encoded in UTF-8.
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But Tidy offers you a choice of other character encodings: US ASCII, ISO
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Latin-1, and the ISO 2022 family of 7 bit encodings.
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<p>
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Tidy doesn't yet recognize the use of the HTML <meta> element for
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specifying the character encoding.</p>
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<p>
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The full set of HTML character references are defined. Cleaned-up output
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uses named character references for characters when appropriate. Otherwise,
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characters outside the normal range are output as numeric character
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references.
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<h2 id=accessibility>Accessibility</h2>
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<p>Tidy offers advice on potential accessibility problems for people using
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non-graphical browsers.
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<h2 id=presentational-markup>Cleaning up presentational markup</h2>
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<p>Some tools generate HTML with presentational elements such as <font>,
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<nobr>, and <center>.
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Tidy's <code>-clean</code> option will replace those elements with CSS style
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properties.
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<p>Some HTML documents rely on the presentational effects of <p> start
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tags that are not followed by any content. Tidy deletes such <p> tags
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(as well as any headings that don’t have content). So do not use <p>
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tags simply for adding vertical whitespace; instead use CSS, or the
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<br> element. However, note that Tidy won’t discard <p> tags that
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are followed by any nonbreaking space (that is, the &nbsp; named
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character reference).
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<h2 id=new-tags>Teaching Tidy about new tags</h2>
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<p>You can teach Tidy about new tags by declaring them in the
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configuration file, the syntax is:</p>
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<pre>
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new-inline-tags: <em>tag1, tag2, tag3</em>
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new-empty-tags: <em>tag1, tag2, tag3</em>
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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 can’t 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>
|
||
<option <% if rsSchool.Fields("ID").Value
|
||
= session("sessSchoolID")
|
||
then Response.Write("selected") %>
|
||
value='<%=rsSchool.Fields("ID").Value%>'>
|
||
<%=rsSchool.Fields("Name").Value%>
|
||
(<%=rsSchool.Fields("ID").Value%>)
|
||
</option>
|
||
</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
|
||
won’t 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>
|
||
<a href="<%=random.site()%>">do you feel lucky?</a>
|
||
</pre>
|
||
<p>
|
||
Tidy can also get things wrong if the PHP, ASP, or JSTE code includes
|
||
quotation marks; for example:
|
||
</p>
|
||
<pre>
|
||
value="<%=rsSchool.Fields("ID").Value%>"
|
||
</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 = $? >> 8;
|
||
if ($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=build-cli>Building the tidy command-line tool</h2>
|
||
<p>For Linux/BSD/OSX platforms, you can build and install the
|
||
<code>tidy</code> command-line tool from the source code using the
|
||
following steps.</p>
|
||
|
||
<ol>
|
||
<li><code>make -C build/gmake/</code></li>
|
||
<li><code>make install -C build/gmake/</code></li>
|
||
</ol>
|
||
|
||
<p>Note that you will either need to run <code>make install</code> as root,
|
||
or with <code>sudo make install</code>.</p>
|
||
|
||
<h2 id=build-library>Building the libtidy shared library</h2>
|
||
<p>For Linux/BSD/OSX platforms, you can build and install the
|
||
<code>tidylib</code> shared library (for use in building other
|
||
applications) from the source code using the following steps.</p>
|
||
|
||
<ol>
|
||
<li><code>sh build/gnuauto/setup.sh && ./configure && make</code></li>
|
||
<li><code>make install</code></li>
|
||
</ol>
|
||
|
||
<p>Note that you will either need to run <code>make install</code> as root,
|
||
or with <code>sudo make install</code>.</p>
|
||
|
||
<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.
|
||
|
||
<div id=toc-button style="">
|
||
<a class=button href="#" onclick="
|
||
javascript:document.getElementById('toc').className = 'show';
|
||
document.getElementById('toc-button').className = 'hide';
|
||
document.getElementById('quickref-button').className = 'hide';"
|
||
>Show TOC</a>
|
||
</div>
|
||
<div id=toc class=hide>
|
||
<a class=button href="#" onclick="
|
||
javascript:document.getElementById('toc').className = 'hide';
|
||
document.getElementById('toc-button').className = 'show';
|
||
document.getElementById('quickref-button').className = 'show';"
|
||
>Close</a>
|
||
<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="#new-config">New configuration options</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="#build-cli">Building the tidy command-line tool</a>
|
||
<li><a href="#build-library">Building the tidylib shared library</a>
|
||
<li><a href="#acks">Acknowledgements</a>
|
||
</ol>
|
||
</div>
|
||
|
||
<div id=quickref-button style="">
|
||
<a class=button href="quickref.html">QuickRef</a>
|
||
</div>
|