- From: James Robinson <jamesr@google.com>
- Date: Wed, 9 Dec 2009 15:59:07 -0800
On Wed, Dec 9, 2009 at 3:19 PM, Jonas Sicking <jonas at sicking.cc> wrote: > On Wed, Dec 9, 2009 at 3:18 PM, Jonas Sicking <jonas at sicking.cc> wrote: > > On Wed, Dec 9, 2009 at 3:06 PM, James Robinson <jamesr at google.com> > wrote: > >> 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 > >> 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. > > > > Why is this more "in theory" for inline scripts than for external > scripts? > > Or rather, why is this more unobservable for inline scripts than for > external scripts? > You're right, there's no real difference in the observability of this behavior for inline vs external scripts. - James > > / Jonas > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.whatwg.org/pipermail/whatwg-whatwg.org/attachments/20091209/78a7b8be/attachment.htm>
Received on Wednesday, 9 December 2009 15:59:07 UTC