line 1 column 1 - Warning: missing declaration
line 6 column 10 - Warning: The summary attribute on the
element is obsolete in HTML5
Info: Document content looks like HTML5
Tidy found 2 warnings and 0 errors!
About HTML Tidy: https://github.com/htacg/tidy-html5
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Latest HTML specification: https://html.spec.whatwg.org/multipage/
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https://github.com/htacg/tidy-html5/blob/master/README/LOCALIZE.md