Item11102: Conditionally render html as html5

Quite some html markup that is emitted by core code is invalid in html5. For instance, anchor links do not have a name attribute, list items do not have a type attribute.

We cannot change this because we will support html 4 for a very long time. A rendering setting can be used to conditionally emit different markup.

Proposal: new "Miscellaneous" setting {RenderedHtmlVersion} with the options 4 (default) and 5.

Core code then renders different html if {RenderedHtmlVersion} is 5.

For instance, Anchors.pm will have 2 ways to render an anchor link:

if ( $Foswiki::cfg{RenderedHtmlVersion} == 5 ) {
   # some code
} else {
        # other code
}

But it would be better if we had a HtmlRenderer class that took care of writing html. This class could have subclasses for html4 and html5.

So we could write: Foswiki::renderer->anchor($name)

-- ArthurClemens - 02 Sep 2011

Absolutely. I have some ideas for this (build a WikiText DOM compatible with CPAN:XML::XPathEngine, but who knows if this will be faster/slower than our existing regex spaghetti), but it requires drastically overhauling Foswiki::Render and Foswiki::Form.

So perhaps it would be worthwhile, as a first step, to make Foswiki::Render pluggable.

-- PaulHarvey - 04 Sep 2011

Having said that, would be nice if we could work towoards polyglot output (both XHTML and HTML5 valid).

-- PaulHarvey - 04 Sep 2011

Actually, named anchors are not a good example because the substitute with element IDs are already supported cross browser. Update: and implemented in Item11389.

Another candidate is meta data, currently in meta tags. In html5 this is no longer allowed: the meta fields are restricted. With a custom tag, the validator will give an error like:

Bad value foswiki.WIKIUSERNAME for attribute name on element meta: Keyword foswiki.wikiusername is not registered.

Is meta data used outside of javascript? Otherwise we could as well write it to head in a script tag using JSON.

-- ArthurClemens - 25 Dec 2011

can't we use the template system to do this? hardcoded or code based html generation is a problem pretty much everywhere

-- SvenDowideit - 26 Dec 2011

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