MDN’s new design is in Beta! A sneak peek:

Type: script code
The code in this attribute is called when the page is hidden, such as when moving to another page. Return true to accept the page change and false to prevent the page from changing. This code is called before the wizard's onwizardnext and related functions.

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 Contributors to this page: Sheppy, Marsf, Ptak82, Dria
 Last updated by: Sheppy,