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Commit 7607d9dd authored by Shaun McCance's avatar Shaun McCance Committed by Daniel Veillard
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Allow HTML serializer to output HTML5 DOCTYPE 

For https://bugzilla.gnome.org/show_bug.cgi?id=747301

Use simple HTML5 DOCTYPE for about:legacy-compat

HTML5 uses a DOCTYPE without a PUBLIC or SYSTEM identifier. It looks
like this:

<!DOCTYPE html>

I can't use XSLT to output this, because to get a DOCTYPE I have to
provide a PUBLIC or SYSTEM identifier. Luckily, the standards folks
recognized this and provided this semantically equivalent form for the
HTML DOCTYPE:

<!DOCTYPE html SYSTEM "about:legacy-compat">

But people don't like seeing the "legacy" identifier in their output.
They'd rather see the shiny new DOCTYPE. Since we know that
about:legacy-compat is defined by the W3C to be semantically equivalent
to the sans-SYSTEM DOCTYPE, we could just special-case it in the HTML
serializer in libxml2. So if you set the SYSTEM identifier to
"about:legacy-compat", you get an HTML5 short-form DOCTYPE.
parent 2fab235d
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