Bug 227349 – Safari v14.1 CSP Violation - Usage of "element.removeAttribute("style")" causes style-src CSP Violation.

• Component: DOM
• Status: RESOLVED FIXED

[Ramya]

Created attachment 432154 [details]
safari-CSP

Usage of element.removeAttribute("style") in safari v14.1 throws the following CSP Violation.

"Refused to apply a stylesheet because its hash, its nonce, or 'unsafe-inline' does not appear in the style-src directive of the Content Security Policy".

    Example:

    function removeStyle(){
        document.getElementById("section").removeAttribute("style"); // throws above CSP violation
    }

    CSP used:

    default-src 'none';
    connect-src 'self';
    script-src 'self';
    style-src 'self';

    Reference:

    Attached HTML file.

    Steps to reproduce:
    
    1. Open the demo html with safari v14.1
    2. Open the console to check the violation reported
    3. Click on change and remove color buttons
    4. Remove button - is executing the following - element.removeAttribute("style")
    5. On click of Remove - the above CSP violation will be reported in the console

[Ramya]

Created attachment 432236 [details]
Updated safari-csp-issue html with text message

[Ramya]

Created attachment 432237 [details]
Updated safari-csp-issue html with text message

[Radar WebKit Bug Importer]

<rdar://problem/80020346>

[Ahmad Saleem]

I am able to reproduce this bug in Safari 15.6 on macOS 12.5 and it gives following message in Console:

Refused to apply a stylesheet because its hash, its nonce, or 'unsafe-inline' does not appear in the style-src directive of the Content Security Policy.

While all other browsers does not show any such message in Console. Thanks!

[Charlie Wolfe]

Pull request: https://github.com/WebKit/WebKit/pull/3333

[EWS]

Committed 254409@main (572f10393126): <https://commits.webkit.org/254409@main>

Reviewed commits have been landed. Closing PR #3333 and removing active labels.

What version on safari is this fixed in?

[Ahmad Saleem]

(In reply to nickygencs from comment #7)
> What version on safari is this fixed in?

Safari 16.4 <- if I am not wrong.

@jensimmons & others might be able to give precise information.