1918794 - Incorrect size on the subgrid axis when using aspect-ratio

Status: NEW

(Core :: Layout: Grid, defect)

Description

[Boris Chiou [:boris]]

Attachment: testcase

When checking if we need to pass the containing block size to a grid item which is a subgrid (for Bug 1865438), I noticed we have a different result from Blink and Webkit when using subgrid and aspect-ratio together. See the attached testcase.

• Expected Result: We should see a 80px * 100px green rect, with a blue small rect at the bottom right corner (just as that result in Blink and WebKit).
• Actual Result: We render a 80px * 80px green rect, with a blue small rect at the bottom right corner.

Also, when I replaced max-height with height in the testcase I attached, I hit this assertion:

MOZ_ASSERT(aspectRatioUsage == AspectRatioUsage::None)

in nsIFrame::ComputeSize().