Can you attach a testcase (html file) to the bug report, please.
Created attachment 8810420 [details] case1.html Ok test html added, that reproduces case 1 for me. Case 2 is visible on the lea.verou site linked above, after resizing it.
Created attachment 8810423 [details] case1.html fixed :) >> document.createElement('div')
Attachment #8810420 - Attachment is obsolete: true
I see the white straight line with IE11 too.
(In reply to Loic from comment #5) > I see the white straight line with IE11 too. Same thing? well, regardless, if background-position is set to half the background-size for the triangles, they should join together with no line in between, should they not?
Doing some research: The w3c draft https://drafts.csswg.org/css-images-3/#typedef-color-stop-list say: "If multiple color stops have the same position, they produce an infinitesimal transition from the one specified first in the rule to the one specified last. In effect, the color suddenly changes at that position rather than smoothly transitioning." So in the example when "rgb(0,0,0) 25%, transparent 25%" there should be a sudden change rather than a transition, and thus no white line, as I understand it. From looking at the screenshots by Loic I assume the white line is a small transition? But if I can see it it is not infinitesimal, if counting pixels.
Status: UNCONFIRMED → NEW
Ever confirmed: true
Priority: -- → P3
See Also: → bug 1314319
Created attachment 8813312 [details] testcase This is the same, but with the unnecessary button and script removed, and with a bit of whitespace cleanup of the markup.
Attachment #8810423 - Attachment is obsolete: true
Component: Layout → Layout: View Rendering
Summary: CSS linear-gradient displays inconsistent → tiles of a CSS linear-gradient background have antialiasing inconsistent with each other
Created attachment 8849504 [details] ff52 google image checkboard I have the same visual artifacts with the checkerboard Google Image uses for transparent PNG. Interestingly, rendering is ok with hardware acceleration disabled. (about:config -> layers.acceleration.disabled = true) Firefox 52.0.1 x64 on Windows 7, using quite old nVidia drivers but not blacklisted.
Created attachment 8849535 [details] nightly devtools image preview Same problem again with the image preview from the devtools' inspector, although more subtle.
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