Bug 262078 – [mac] WebDriver sometimes taking screenshots with transparent grey line at the top and no rounded corners

• Status: RESOLVED
• Resolution: FIXED
• Component: WebKit Misc.

[Sam Sneddon [:gsnedders]]

see, e.g., https://wpt.fyi/results/css/css-contain?q=%28label%3Ainterop-2022-contain%20or%20label%3Ainterop-2023-contain%29%20is%3Adifferent&run_id=5179945829007360&run_id=5129256222326784&run_id=5105446492307456

e.g. https://wpt.fyi/analyzer?screenshot=sha1%3Aa8193aa1d36a2e7c269c79da3fdfef70d986dd6d&screenshot=sha1%3A1bc22df9e9199ea9890c7d35fbf48b11b87cf11b or https://wpt.fyi/analyzer?screenshot=sha1%3A8d5e20aecf8b5cc808f48b90c8ee7e09f88d3c38&screenshot=sha1%3Abc778655cc0444e393609feb97a0948c43475817

We seem to end up with a transparent grey overlay at the top (the shadow from the tab bar?), one pixel high. What's more odd given that is we also are lacking the rounded corners we'd expect from the window, which extends for more than a single pixel—so we aren't just cropping the screenshot of the window off-by-one-pixel, we have some larger difference here.

[Radar WebKit Bug Importer]

<rdar://problem/116020785>

[Sam Sneddon [:gsnedders]]

Created attachment 468459 [details]
Bad screenshot from the first example

[Sam Sneddon [:gsnedders]]

Created attachment 468460 [details]
Good screenshot from the first example

[EWS]

Committed 281887@main (bdd0eaf1d28f): <https://commits.webkit.org/281887@main>

Reviewed commits have been landed. Closing PR #31013 and removing active labels.

[Qianlang Chen]

Reopened Bugzilla.
[WebDriver] Remove the unused ForceSoftwareCapturingViewportSnapshot option, tracking revert in https://bugs.webkit.org/show_bug.cgi?id=279075.

[Qianlang Chen]

This bug was reopened automatically by mistake. The described WebDriver screenshot has been fixed.