Send mouse back/forward buttons to javascript

Category: User input
Type: New or changed feature
Status: Enabled by default (Chrome 67)
Intent stage: None

Summary

Web pages can now process mouse events (mousedown, auxclick, mouseup) for back and forward buttons on mice with five or more buttons. This allows back and forward mouse buttons to be prevented by applications that wish to override them. For example they may be useful for games.

Standards & signals

Specification: https://w3c.github.io/pointerevents/#the-button-property
Firefox: No signal
Safari: No signal
Web developers: Positive
Tracking bug: https://crbug.com/680741

Docs: https://github.com/w3c/pointerevents/issues/191

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