Title Input Box Shouldn't Support Formatting

[MaximilianEmel]

The title input box for a new title, allows formatted text to be pasted, which shouldn't be the case, since it isn't sent off anywhere, and can therefore be confusing.

[ajayyy]

What do you mean by formatted text?

[MaximilianEmel]

(Copy-pasted from LibreOffice Writer into Firefox)

[rmw4269]

While this isn’t a perfect fix, it is simple, and the problem is also not a big issue. The text input field has this (simplified) HTML <span contenteditable="true">. The contenteditable attribute is what allows the element to act as a text input. Modifying the attribute to contenteditable="plaintext-only" should allow text input without formatting. This new-ish option is only supported in about 83% of desktop browsers, and some testing needs to be done to ensure that browsers that don’t support this still allow text input (as, technically, invalid values are supposed to use the ‘inherit’ state).

I think that support can be tested like below.

try {
    let e = document.createElement("span");
    e.contentEditable = "plaintext-only";
    // supported
    // Use contenteditable="plaintext-only".
} catch (error) {
    if (! (error instanceof SyntaxError)) { throw error; }
    // not supported
    // Use contenteditable="true", and add a listener similar to below, maybe triggered when the element loses focus.
    function listener({target}) {
        target.textContent = target.textContent;
    }
}