[Webkit-unassigned] [Bug 225226] New: Blob contentType with charset renders html as plain text

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225226

            Bug ID: 225226
           Summary: Blob contentType with charset renders html as plain
                    text
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pasel at blueend.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Running Safari on iOS 14.5 (iPhone, iPad) will render HTML content as plaintext when the Blob.type is 'text/html; charset=UTF-8'.


Reproduktion Example:

https://jsfiddle.net/9h71Lqb0/

The following code will not work in iOS 14.5 anymore:

var html = `<h1>This is Blob Content</h1>`;
var blob = new Blob([html], {type: 'text/html; charset=UTF-8'});
var iframe = document.querySelector("iframe");
iframe.src = URL.createObjectURL(blob);


The following code is working as expected and showcases the behaviour in earlier versions:

var html = `<h1>This is Blob Content</h1>`;
var blob = new Blob([html], {type: 'text/html'});
var iframe = document.querySelector("iframe");
iframe.src = URL.createObjectURL(blob);


There might be some connection/relation to https://bugs.webkit.org/show_bug.cgi?id=225057 which has been submitted earlier this week.

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