Deprecation warning: Do not use
watch()! These two methods were implemented only in Firefox prior to version 58, they're deprecated and removed in Firefox 58+. In addition, using watchpoints has a serious negative impact on performance, which is especially true when used on global objects, such as
window. You can usually use setters and getters or proxies instead.
unwatch() method removes a watchpoint set with the
By default, this method is inherited by every object descended from
Note: The reason for
unwatch() to take the property name prop as its only parameter is due to the "single handler allowing" behavior of the
|Basic support||No||No||1 — 58||No||No||No|
|Android webview||Chrome for Android||Edge Mobile||Firefox for Android||Opera for Android||iOS Safari||Samsung Internet|
|Basic support||No||No||No||4 — 58||No||No||No|
Documentobject throws a
TypeErrorsince Firefox 23 (bug 903332). This regression has been fixed with Firefox 27.
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