1642280 - [e10s] The image with srcset will be blurred until you reload tab if site-specific zoom level is set

Status: NEW

(Core :: Layout: Images, Video, and HTML Frames, defect, P3)

Description

[Alice0775 White]

Attachment: Screenshot

The image like
<img alt="" src="Typeface_Simple_Zilla_Slab.png" decoding="async" class="thumbimage" srcset="Typeface_Simple_Zilla_Slab_001.png 1.5x, Typeface_Simple_Zilla_Slab_002.png 2x" data-file-width="800" data-file-height="1040" width="220" height="286">

Disabling e10s will fix the issue.
This is reproduced on Firefox47.0a1(20160125060122) at least if e10s is enabled.
So, I think this is e10s implementation bug rather than a regression bug.

Reproducible: always.

Steps to reproduce:

1. Open https://en.wikipedia.org/wiki/Mozilla
2. Zoom in several times to 200%
   --- observe, the image is clear.
3. Reopen https://en.wikipedia.org/wiki/Mozilla in tab or duplicate tab
   --- observe, the image is blurry. --- BUG
4. Reload
   --- observe, the image becomes clear.

Actual Results:
The image is blurry until reload the tab.

Expected Results:
The image should be clear at initial web page load.
I.e., The image should be rendered properly using srcset for the zoom level.

Comment 1

[Jacob Bundgaard]

It's almost the opposite problem of https://bugzilla.mozilla.org/show_bug.cgi?id=1503652, but the same test site (XKCD) also demonstrates it.