[Webkit-unassigned] [Bug 245941] New: IntersectionObserver Api Ratio Less Than 1 While Toolbar Visible

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=245941

            Bug ID: 245941
           Summary: IntersectionObserver Api Ratio Less Than 1 While
                    Toolbar Visible
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Intel)
                OS: iOS 16
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mohammadmahdi1383 at outlook.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 462761

  --> https://bugs.webkit.org/attachment.cgi?id=462761&action=review

Image of example on Safari 16 - iPhone14 - iOS 16

Problem:

IntersectionObserver api in every desktop browser and mobile browsers that does not have `Toolbar` like safari on bottom of the webpage, is giving the intersectionRatio of `1` when the observed target reached the top of view:

------------------- <-- top of browser web view
+++++++++++++++++++ <-- ELEMENT THAT REACHES THE TOP
|   Hello World   |
|                 |
+++++++++++++++++++


------------------- <-- bottom of browser web view

But in Safari on iOS with Toolbar that in the browser view, it gives the value of ~0.9 for intersectionRatio which is INCORRECT!?

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