17 Apr
2014
17 Apr
'14
3:45 p.m.
On Tue, Apr 15, 2014 at 1:09 PM, Guillaume "Louis-Marie" Delhumeau
<gdelhumeau(a)xwiki.com> wrote:
(There is already a JIRA issue about this topic, see
http://jira.xwiki.org/browse/XWIKI-7552 ).
The new skin, Flamingo, uses the Bootstrap Framework, which is designed to
be used with HTML5. For example, the drop down buttons [1] use the
attributes "data-*" that was introduced recently and that are not valid in
XHTML 1.0 Strict. Since HTML5 is becoming the new standard, I think it's
time to switch to HTML5, at least for Flamingo.
With the help of Thomas, I have already added an HTML5 validator in our
build tools, based on validator.nu [2]. In the future, we need to change
the enterprise tests suite to use this validator and the flamingo skin.
-------------------------
What are the blockers ?
-------------------------
-----
Meta tags
-----
In Colibri headers, we used to define some meta tags used by some
javascript components. These tags are:
- <meta name="document" content="Main.WebHome"/>
- <meta name="wiki" content="xwiki"/>
- ... and so on.
In my opinion, they are useless, because we also defines some variables:
- XWiki.currentWiki = "xwiki";
- XWiki.currentSpace = "Main";
- XWiki.currentPage = "WebHome";
- ... and so on.
The problem is: these tags are not valid in HTML5 because the specification
mentions that custom meta names should be registered on
http://wiki.whatwg.org/wiki/MetaExtensions. See
http://www.whatwg.org/specs/web-apps/current-work/multipage/semantics.html#…
.
Other problem: if we simply remove them, we will break some javascript
codes.
-----
Internet Explorer meta tag
-----
Bootstrap defines the following meta-tag:
<meta http-equiv="X-UA-Compatible" content="IE=edge">
It is used to prevent Internet Explorer from using the compatibility mode
(which is the default setting on intranet sites). As before, this meta tag
is not valid. It is interresting to notice that even the bootstrap site is
not valid, because of that.
In my opinion, we need this meta-tag and we should ignore this HTML5
violation.
-----
Use HTML5 or XHTML5?
-----
XHTML5 is only a subset of HTML5 so that it is XML compliant. If we want to
use it, we need to change the MIME type of our pages to
"application/xhtml+xml" or "application/xml" [3]. But then, the
browser is
not error-tolerant anymore (I have only tested with Firefox and I hit the
issue).
-----
Update HTMLCleaner
-----
HTML Cleaner generates this code:
<img src="..."></img>
which is not valid.
------------------------
Proposal
------------------------
1. Break the javascript compatibility and remove
invalid <meta> tags,
except the Internet Explorer specific one.
No. Remove them from the HTML generated on the server *but* add them
from JavaScript (from compatibility.js for instance) so that
extensions that still need them continue to work.
We do something similar for instance with the 'rel' attribute which is
transformed into 'target' on the client.
2. Update the HTML Cleaner.
+1
3. Use HTML5 to avoid the XML specific problems. We
can change this in the
future.
Why not generate XHTML5 on the server but with the default HTML5
doctype (at least for now). I mean, we validate our pages against
XHTML5 but we tell the browser it's HTML5. I don't see any problem
with this.
4. Do not touch the XWiki Rendering code because it
generates XHTML, which
is still valid in HTML5 [4]. Same for the WYSIWYG editor.
+1
5. Update the enterprise test suite to also tests
pages with the flamingo
and the new HTML5 validator.
+1
Thanks,
Marius
WDYT?
Louis-Marie
----------------------
Links
----------------------
[1] http://getbootstrap.com/components/#btn-dropdowns
[2] http://jira.xwiki.org/browse/XWIKI-10249
[3] http://en.wikipedia.org/wiki/HTML5#XHTML5_.28XML-serialized_HTML5.29
[4] http://en.wikipedia.org/wiki/Polyglot_markup
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