[Webkit-unassigned] [Bug 175568] data: URL base64 handling different from atob()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=175568

--- Comment #3 from Chris Dumez <cdumez at apple.com> ---
Looking at DataURLDecoder, I see the following logic:
    // First try base64url.
    if (!base64URLDecode(task.encodedData.toStringWithoutCopying(), buffer)) {
        // Didn't work, try unescaping and decoding as base64.
        auto unescapedString = decodeURLEscapeSequences(task.encodedData.toStringWithoutCopying());
        if (!base64Decode(unescapedString, buffer, Base64IgnoreSpacesAndNewLines))
            return;
    }

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