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Add onbeforeinput global event handler content attribute

Category

DOM

Type

No developer-visible change

Status

Enabled by default (Chrome 105)

Intent stage

Prepare to ship

Summary

The 'beforeinput' event fires when the value of an <input>, <textarea>, or contenteditable element is about to be modified. Add an 'onbeforeinput' global content attribute to make it easier for developers to use.

Motivation

The 'beforeinput' event can already be utilized via addEventListener('beforeinput',...). This change makes it easier to use via element.onbeforeinput = .... It also allows testing for 'beforeinput' browser support via `document.documentElement.onbeforeinput === null`.

Standards & signals

• Specification: https://html.spec.whatwg.org/#handler-onbeforeinput
• Firefox: Shipped/Shipping
• Safari: Shipped/Shipping
• Web developers: Positive
• Tracking bug: https://crbug.com/947408

Explainers: https://github.com/whatwg/html/pull/7992

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