beforeprint and afterprint events

Category: Miscellaneous
Type: New or changed feature
Status: Enabled by default (Chrome 63)
Intent stage: None

Summary

'beforeprint' event is dispatched before starting printing, and 'afterprint' event is dispatched after finishing printing. They are useful to build printing-only content, and clean it up.

Standards & signals

Specification: https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#printing-steps
Firefox: Shipped/Shipping
Safari: No signal
Web developers: Positive
Tracking bug: http://crbug.com/218205

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