W3C

Web Performance

07 Oct 2015

Agenda

Attendees

Present
yoav, plh, todd, ilya
Regrets
eliperelman
Chair
Ilya
Scribe
plh

Contents


Date: 07 Oct 2015

Definition of current document

The term current document refers to the document associated with the Window object's newest Document object.

The term current document refers to the Window object's newest Document object.

Ilya: looks like it's in plh's pile
... we can raise a bug against the html spec
... I'll raise it

Clarify Resource Timing terminology

<igrigorik> @ https://github.com/w3c/resource-timing/pull/38

plh: I'll address the history section
... and merge it after that

Can hidden attribute be removed? (Page Visibility)

https://github.com/w3c/page-visibility/issues/12

Yoav: do we want to deprecate one?

http://www.w3.org/2013/02/pv-cr-report.html

Ilya: not sure if we have telemetry

Yoav: we could also add a note but we need stats first

Todd: the hidden attribute is one of the most used attributes that are currently monitored
... visibilityState is used less

Ilya: sounds like we can add a note but not deprecate it
... I'll propose one
... also unloaded is not supported by any browser
... I'll open an issue

Yoav: it's optional in the spec. remove?

Ilya: we'll tackle those changes before publishing a new draft

queue Frame Timing events for each fully active document

<igrigorik> @ https://github.com/w3c/frame-timing/pull/50

Ilya: FT doesn't account for iframe, only for current document

Todd: might be worth asking Eli to look at it

Ilya: ok

Yoav: diff between active and current document?

Ilya: some documents that may be suspended

Yoav: so they may be current but not active?

Ilya: correct

User Timing rewrite and cleanup

Todd: for clearMarks, it will change the return values for getEntries
... it says it empties the mark list, but need to clean the performance entry buffer

Ilya: set of objects associated with the performance object
... which is the timeline
... and user timing will follow that

plh: ok, i'll continue to iterate

Implementation links in specs?

plh: see what I did for http://w3c.github.io/page-visibility/

Ilya: I wouldn't want to keep an up-to-date list. linking to can I use and make sure.

plh: I'll update all of our specs to add the info

https://github.com/w3c/web-platform-tests/tree/master/page-visibility

http://w3c-test.org/page-visibility/

plh: I'll link to both

Resources Hints

Yoav: dnsprefetch doesn't work when the page is https
... there is a flag for it
... it's off by default

<yoav> https://www.chromium.org/developers/design-documents/dns-prefetching#TOC-DNS-Prefetch-Control

Yoav: same is true for firefox
... I don't understand the restriction, since we'll need to do the dns request eventually

"This restriction helps prevent an eavesdropper from inferring the host names of hyperlinks that appear in HTTPS pages based on DNS prefetch traffic. "

Yoav: can we remove the restriction?

Ilya: my guess is that it's tied to the predictor
... and we didn't want to leak information
... and we just carried the same mechanism in the dns-prefetch
... but I agree with you

Yoav: I'll open an issue and loop in Mike West and Ryan, and others (Firefox, MS)
... everyone should dns-prefetch over https because limitating it doesn't make sense
... I'll raise a spec issue

[adjourned]

<yoav> igrigorik: You were right. The reason this dns-prefetch limitation exists is coupling between explicit <link rel=dns-prefetch> and speculative prefetching of DNS for <a href> in the page

<yoav> I'm not sure it merits a spec issue, or just filing patches to decouple that

Summary of Action Items

[End of minutes]

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$Date: 2015/10/21 16:58:17 $