Open Bug 1439710 Opened 3 years ago Updated 3 years ago

object-position and animations


(Core :: DOM: Animation, defect, P3)

58 Branch





(Reporter: markzank, Unassigned)


User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0
Build ID: 20180206200532

Steps to reproduce:

Any animation using object-position to pan thru an image bigger than its container, modality object-fit:cover :
@keyframes simpleanimation {
 from { object-position:left top; }
 to { object-position:right bottom; } }

Actual results:

Image wobbles during the whole animation, alternating base pixels with +-1 difference.

Expected results:

No continuous alternating rounding errors of 1 pixel, just a steady animation (chrome works perfectly).
Component: Untriaged → DOM: Animation
Product: Firefox → Core
Priority: -- → P3
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