[Webkit-unassigned] [Bug 194948] New: SVG load external file via <use> ignores ServiceWorker when offline

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194948

            Bug ID: 194948
           Summary: SVG load external file via <use> ignores ServiceWorker
                    when offline
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Service Workers
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkit at laszlokorte.de

Created attachment 362727

  --> https://bugs.webkit.org/attachment.cgi?id=362727&action=review

Example with one html and one svg file

When referencing an external SVG (external.svg) inside an inline SVG inside an html file (index.html) via <use href="external.svg#someid"> and caching everything via ServiceWorker (cache.addAll(["index.html", "external.svg"])) the <use> tag does not display the cached version from the service worker when offline but displays nothing as if the file is not found.

But when accessing the svg directly via adress bar it can (of course) be loaded even when offline. Loading the external SVG via <img> tag does also work when offline. 

So it seems there is a bug when combining <use> tag an ServiceWorker.

I have attached an example. In other browsers (chrome and firefox) it works fine.

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