STR: 1. Set the following about:config prefs: ``` layout.css.content-visibility.enabled = true layout.css.content-visibility-relevant-content-margin = 0 ``` 2. Load attached testcase. ACTUAL RESULT: Oscillating/flashing rect. It looks like the div is switching between being considered "relevant" vs. "not-relevant". EXPECTED RESULT: Stable layout (hopefully this isn't something that's intended to fall out of the spec...) When it's considered relevant, it renders at its actual 0x0 content size which places it entirely offscreen, which then makes it not-relevant, which then grows it to its `contain-intrinsic-size`-imposed size, which then places it back on-screen, which makes it relevant, etc.
Bug 1804761 Comment 0 Edit History
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STR: 1. Set the following about:config prefs: ``` layout.css.content-visibility.enabled = true layout.css.content-visibility-relevant-content-margin = 0 ``` 2. Load attached testcase. ACTUAL RESULT: Oscillating/flashing rect. It looks like the div is switching between being considered "relevant" vs. "not-relevant". EXPECTED RESULT: Stable layout. (hopefully the actual-results aren't something that's intended to fall out of the spec...) When it's considered relevant, it renders at its actual 0x0 content size which places it entirely offscreen, which then makes it not-relevant, which then grows it to its `contain-intrinsic-size`-imposed size, which then places it back on-screen, which makes it relevant, etc.