Bug 184303 – Element.getClientRects returns only the first box fragment of fragmented elements

• Component: DOM
• Status: NEW

[Matt Curtis]

Created attachment 337170 [details]
An example document demonstrating the issue.

Overview: The W3C specification (https://drafts.csswg.org/cssom-view/#dom-element-getclientrects) states that Element.getClientRects should return the all box fragments for fragmented elements, however WebKit's implementation only seems to return the first.

Steps to Reproduce:

1) Create a document where the body is fragmented using (column-count: 2). See attached example document.

2) Run Element.getClientRects() on the first child element of the body.

Expected Results: Both box fragments are returned.

Build Date & Hardware: Safari Technology Preview 52, macOS 10.13.4.

Additional Builds and Platforms: Observed in simulator and on-device for iOS 11.3.

Additional Information: None.

[Ahmad Saleem]

I am not sure on expected beahvior but in attached test case, these are results across browsers:

*** Safari 15.6 on macOS 12.5 ***

Box fragment count: 2

it shows same on iOS 15.6 using iPhone 13 Pro Max.

*** Chrome Canary 106 ***

Box fragment count: 2

*** Firefox Nightly 105 ***

Box fragment count: 1

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Going by Comment 0, Safari is returning both box fragments and this is bug in Firefox but I am not clear on web-spec so I would just share updated test results here. Thanks!