[Webkit-unassigned] [Bug 179890] New: Page loading indicator freezes indefinitely when navigating to a missing #anchor after first page load

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179890

            Bug ID: 179890
           Summary: Page loading indicator freezes indefinitely when
                    navigating to a missing #anchor after first page load
           Product: WebKit
           Version: Safari 11
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jstanden+webkit at gmail.com
                CC: beidson at apple.com

Overview:
In Safari (Mac) 10.1 and 11.0 (but not 9.1) the page loading indicator freezes indefinitely when navigating to an #anchor after a page has already loaded.

Steps to reproduce:
1. In an affected version, navigate to a page like https://bugs.webkit.org/
2. Let the page finish loading.
3. In the location bar (Cmd+L) append "#missing-anchor" to the existing URL and press <ENTER>.

Actual result:
The page loading indicator progresses to about 10% and freezes there indefinitely.

Expected result:
Since the #anchor doesn't exist, we expect nothing to happen. The scrollbar would remain in the same position, and the page loading indicator would finish almost instantly (if it displayed at all).

This issue occurs on Safari 10.1 and 11.0 on Mac Sierra + High Sierra. I tested on several different machines, including BrowserStack. I tested using many different websites. The issue existed everywhere on the affected versions.

This issue doesn't occur on Safari 9.1 (or any other major browsers).

The issue doesn't occur if you navigate directly to a URL like https://bugs.webkit.org/#missing-anchor -- it only occurs when you link to a non-existing #anchor on a previously loaded page.

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