-* the [time element](http://www.whatwg.org/specs/web-apps/current-work/multipage/text-level-semantics.html#the-time-element) ideally needs the datatime= attribute set with iso8601 time
-* I suspect the migration to the new semantic elements of HTML5 like article, header & footer to take some time, due to browser support. Though they sure make the template code look much nicer.
-* `<br>` and too many `<div>`s usually indicates poor semantics.
-* Many of the header `<span>`s should be proper [header elements](http://www.whatwg.org/specs/web-apps/current-work/multipage/semantics.html#the-h1,-h2,-h3,-h4,-h5,-and-h6-elements)
+> Many added now.
+>
+> Things I left out, too hard to understand today:
+> Attributes contenteditable,
+> data-\*, draggable, role, aria-\*.
+> Tags command, keygen, output.
+>
+> Clearly unsafe: embed.
+>
+> Apparently cannot be used w/o javascript: menu.
+>
+> I have not added the new `ping` attribute, because parsing a
+> space-separeated list of urls to avoid javascript injection is annoying,
+> and the attribute seems generally dubious.
+> --[[Joey]]
+
+# HTML5 Validation and t/html.t
+
+[validator.nu](http://validator.nu/) is the authorative HTML5 validator,
+however it is almost impossible to sanely introduce as a build dependency
+because of its insane Java requirements. :( I test locally via
+[cURL](http://wiki.whatwg.org/wiki/IDE), though Debian packages cannot be built
+with a network dependency.
+
+In the future, hopefully ikiwiki can test for valid HTML5 using [Relax NG
+schema](http://syntax.whattf.org/) using a Debian package tool
+[rnv](http://packages.qa.debian.org/r/rnv.html).
+
+> Validation in the test suite is nice, but I am willing to lose those
+> tests for a while. --[[Joey]]
+
+# HTML5 migration issues
+
+# [article](http://www.whatwg.org/specs/web-apps/current-work/multipage/semantics.html#the-article-element) element
+
+This element is poorly supported by browsers. As a workaround, `style.css` needs:
+
+ article {
+ display: block;
+ }
+
+Internet Explorer will display it as a block, though you can't seem to be able to further control the style.
+
+> done (needed for header too) --[[Joey]]
+
+## Time element
+
+The [time element](http://www.whatwg.org/specs/web-apps/current-work/multipage/text-level-semantics.html#the-time-element) ideally needs the datatime= attribute set by a template variable with what [HTML5 defines as a valid datetime string](http://www.whatwg.org/specs/web-apps/current-work/multipage/infrastructure.html#valid-global-date-and-time-string).
+
+As a workaround:
+
+ au:~% grep timeformat natalian.setup
+ timeformat => '%Y-%m-%d',
+
+> Also, the [[plugins/relativedate]] plugin needs to be updated to
+> support relatatizing the contents of time elements. --[[Joey]]
+
+> Done and done; in html5 mode it uses the time tag, and even
+> adds pubdate when displaying ctimes. --[[Joey]]
+
+## tidy plugin
+
+Will reformat html5 to html4.
+
+----
+
+
+Ok, I consider this [[done]], at least as a first pass. Html5 mode
+is experimental, but complete enough. --[[Joey]]