[whatwg] HTMLLinkElement.disabled and HTMLLinkElement.sheet behavior
ian at hixie.ch
Thu Jan 26 16:30:47 PST 2012
On Tue, 4 Oct 2011, Julien Chaffraix wrote:
> following WebKit's attempt at implementing the behavior of |sheet| and
> |disabled| per HTML5 / CSSOM , we have found that the specs  
> either under-specify the behavior or do not match what browsers are
The spec has changed a bit since your e-mail; can you check again and see
if the improvements are sufficient?
> * Opera and FF always have an associated stylesheet if |link.rel|
> matches a stylesheet and |href| is set.
> * They both fill link.sheet with default values even if the stylesheet
> was / ends up in error.
This is per the spec now.
> * However, FF loads the stylesheet synchronously whereas Opera does it
> asynchronously from a JS perspective
This is required per the spec: a pending <link rel=stylesheet> load does
block certain scripts from executing.
> * Some websites (4chan.org for examples) assumes that the |sheet| is
> always available and that |disabled| will work properly regardless of
> when it is called.
This is now per spec as far as I can tell.
On Wed, 5 Oct 2011, Henri Sivonen wrote:
> On Tue, Oct 4, 2011 at 9:54 PM, Boris Zbarsky <bzbarsky at mit.edu> wrote:
> > What Firefox does do is block execution of <script> tags (but not
> > timeouts, callbacks, etc!) if there are pending non-altenate
> > parser-inserted stylesheet loads. This is necessary to make sure
> > that scripts getting layout properties see the effect of those
> > stylesheets. A side-effect is that a <script> coming after a <link>
> > will never see the link in an unloaded state... unless there's a
> > network error for the <link> or whatever.
> One exception: If an inline script comes from document.write(), it
> doesn't block on pending sheets. It runs right away. If it blocked on
> pending sheets, the point at which document.write() returns would depend
> on network performance, which I think would be worse than having
> document.written inline scripts that poke at styles fail depending on
> network performance.
Note that this is not conforming. The spec does not currently define any
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
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