- From: James Robinson <jamesr@google.com>
- Date: Wed, 9 Dec 2009 15:06:00 -0800
On Wed, Dec 9, 2009 at 2:57 PM, Jonas Sicking <jonas at sicking.cc> wrote: > On Wed, Dec 9, 2009 at 2:10 PM, James Robinson <jamesr at google.com> wrote: > > 2009/12/9 tali garsiel <t_garsiel at hotmail.com> > >> > >> Well, not completely. > >> Regarding the first question- Webkit guys told me (on their IRC channel) > >> that the don't block the parser and only block scripts that request > visual > >> information, so I'm still confused. > > > > Here's my understanding of the implementation inside WebKit currently: > > During parsing, WebKit does not block the parser on stylesheet loads, but > > does block external scripts from running until previously-encountered > > stylesheets have loaded. WebKit does not suspend script execution on > > requests for visual information if stylesheets have not loaded (for > example > > for inline scripts or in the case of stylesheets added dynamically after > > parsing has completed). WebKit does suspend parsing of the document on > > script loads, but has a speculative preloader to attempt to start fetches > > for resources past the <script> tag. > > Why does webkit treat external scripts different from inline scripts > here? I.e. why is an inline script allowed to run even if there are > pending stylesheet loads, but external scripts not? That seems > inconsistent and confusing. > > Is this considered a bug or desired behavior? > The former: http://trac.webkit.org/browser/trunk/WebCore/html/HTMLTokenizer.cpp#L2017 <http://trac.webkit.org/browser/trunk/WebCore/html/HTMLTokenizer.cpp#L2017>I'm not sure how much this matters in practice. In theory, this is unobservable to the page unless it queries the loaded stylesheets directly or a property derived from layout both of which should suspend script execution. - James > > / Jonas > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.whatwg.org/pipermail/whatwg-whatwg.org/attachments/20091209/8cf4fa8c/attachment.htm>
Received on Wednesday, 9 December 2009 15:06:00 UTC