1031963 - csscoverage report shows incorrect diagram data

Status: NEW

(DevTools :: Style Editor, defect, P3)

Description

[Šime Vidas]

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:30.0) Gecko/20100101 Firefox/30.0 (Beta/Release)
Build ID: 20140605174243

Steps to reproduce:

Test A:

1. Open this page in Firefox Nightly: http://direct.webplatformdaily.org/csscoverage.html
2. Open the CLI (Ctrl + F2) and run "csscoverage oneshot", then "csscoverage report"

Test B: 

1. On the same page, close DevTools/CLI and reload the page, then open the DevTools on the Debugger panel.
2. Reload the page again. The page rendering will be paused at the debugger; <script>
3. Run "csscoverage oneshot", then resume the break point, then run "csscoverage report"


Actual results:

Test A: The report shows: Used = 5, Unused = 5
Test B: The report shows: Used = 5, Unused = 3


Expected results:

Test A: The report should show: Used = 5, Unused = 0
Test B: The report should show: Used = 3, Unused = 2

Comment 1

[:Gijs (he/him)]

This is reproducible on Nightly on OS X as well. Joe? :-)

Comment 2

[Joe Walker [:jwalker]]

TL;DR We should re-visit this once bug 1035300 is fixed.

There are probably 2 parts to this type of problem. Bug 1035300 is for oneshot just not being good enough for reports. The second is what happens when the debugger allows page load to happen at unexpected times. I think we're likely to say that results are invalid if you do that, or that coverage stops when a breakpoint is hit.

Comment 3

[Patrick Brosset <:pbro>]

Inspector bug triage (filter on CLIMBING SHOES).