[Webkit-unassigned] [Bug 244264] New: Wrong viewport-relative units behaviour with WKWebView in Web App

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244264

            Bug ID: 244264
           Summary: Wrong viewport-relative units behaviour with WKWebView
                    in Web App
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
               URL: https://romanczerki.es/svb/
                OS: All
            Status: NEW
          Severity: Major
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: konrad110392 at icloud.com

Created attachment 461830

  --> https://bugs.webkit.org/attachment.cgi?id=461830&action=review

HTML and style to reproduce the issue.

If you open an external link in Home Screen web app and close that one, the web app viewport change.
This cause wrong calculation on block-size viewport-relative units.

* A « jump » appear in the web app during the WKWebView page load.
* After WKWebView closed, the block-size layout has changed.

The layout seems to keep the WKWebView header or navigation block size.

Example with the red part with « block-size: 99svb » (add to Home Screen to see the issue) : https://romanczerki.es/svb/

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