Bug 252075

Created attachment 464947 [details] A demonstration of how 1lh changes as you zoom in and out of the page When used in a linear-gradient() CSS image, the computed value of `1lh` incorrectly changes based on zoom level. In the attached test case, the paragraph has these styles: p { line-height: 1.3; font-size: 20px; padding: 1lh; margin: 1lh; border: 1px solid; background-image: linear-gradient( transparent 0 1lh, #fc0 1lh 2lh, transparent 2lh 100% ); } Zooming in and out of the page, the `margin` and `padding` are computed to `26px`, but the background image that highlights the first line of the paragraph gets out of sync. The issue is not present in Chrome 109+.