[Webkit-unassigned] [Bug 255205] New: InvalidCharacterError: The string contains invalid characters on the webfrontend of a FRITZ!Box router

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255205

            Bug ID: 255205
           Summary: InvalidCharacterError: The string contains invalid
                    characters on the webfrontend of a FRITZ!Box router
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: white.dog8802 at hjkl-mail.de

Created attachment 465822

  --> https://bugs.webkit.org/attachment.cgi?id=465822&action=review

Error message in the web inspector

When opening the network settings of the web frontend a FRITZ!Box router (running FRITZ!OS 7.50) the rendering of the page is interupted by this Error message in web inspector:

InvalidCharacterError: The string contains invalid characters

It refers to the function setAttribute in line 13:102 in the file html2.js, which is in combination with line 12:

function createAttributes(el, attributes={}) {
    for (let name in attributes) {
        if (attributes.hasOwnProperty(name)) {
            let value = attributes[name];
            name = name.toLowerCase();
            if (!checkAndSetEventHandler(el, name, value)) {
                if (value === true) {
                    value = "";
                }
                if (value === null || value === false) {
                    el.removeAttribute(name);
                } else if (value !== undefined) {
                    el.setAttribute(name, value);
                }
            }
        }
    }
}

I could reproduce this errror in Safari on iOS 16.4.1 and macOS 13.3.1 and also the Technology Preview 167. Chrome 112.0.5615.49 and Firefox 111.0.1 display the page w/o a problem or error.

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