> On Feb 23, 2015, at 5:26 PM, James Robinson <jam...@chromium.org> wrote: > > On Mon, Feb 23, 2015 at 4:57 PM, Simon Fraser <s...@me.com> wrote: > >> https://html.spec.whatwg.org/multipage/webappapis.html#processing-model-9 >> says: >> >> 1. Let now be the value that would be returned by the Performance object's >> now() method >> 2. Let docs be the list of Document objects associated with the event loop >> in question… >> ... >> 4. For each fully active Document in docs, run the resize steps for that >> Document, passing in now as the timestamp >> ... >> >> This makes no sense, as performance.now() is per-document (it’s relative >> to the document start time), so passing the same value to all documents in >> the browsing context is bogus. >> >> What may be intended is to “freeze” the performance.now() time in all >> documents before processing those documents, but give each document its own >> performance.now() time. >> > > That is the intent. The algorithm should grab a timestamp for each > document "at the same time" (which is really just a matter of grabbing one > timestamp and applying the correct offset for each document).
In that case, step 1 should probably define a list of timestamps, not the value. Alternatively, "now" should be defined for each document. - R. Niwa
