W3C home > Mailing lists > Public > public-web-perf@w3.org > May 2013

Re: navigationStart in NavigationTiming

From: Boris Zbarsky <bzbarsky@MIT.EDU>
Date: Wed, 01 May 2013 20:49:22 -0400
Message-ID: <5181B812.9050307@mit.edu>
To: Arvind Jain <arvind@google.com>
CC: Jatinder Mann <jmann@microsoft.com>, "public-web-perf@w3.org" <public-web-perf@w3.org>
On 5/1/13 5:48 PM, Arvind Jain wrote:
> If there is no previous document and the current
> document is "about:blank", this attribute must return the time when the
> document was created.

I don't think we need the "the current document is 'about:blank'" bit, 
even.  Any case when there is no previous document means the document is 

> I actually feel it's better to just not mention the case of "there is no
> previous document" and current document = about:blank.

If we don't mention it, what defines the behavior?

> Please also look at the processing model for navigation here:
> http://www.w3.org/TR/html5/browsers.html#navigate - it simply assumes
> there is a previous document (Step 9)

When _navigating_ there is a previous document in all cases.  But the 
initial about:blank is not navigated to; it's just created.  But it has 
a performance.timing, and we need to define what the values in that are. 
  We can define them to be creation time, or all 0, or whatever, but we 
need to define them.

> What would be the ideal definition of these 3 attributes according to you?

I don't actually have a strong opinion about how we should define the 
behavior of performance.timing for the initial about:blank.  It just 
needs to be defined.

Received on Thursday, 2 May 2013 00:49:52 UTC

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