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:
border: 1px solid;
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+.