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Fires when the user starts to select text. Yes Yes Keyboard help onhelp Fires when the user initiates help. Yes Yes HTML frame/object beforeunload onbeforeunload Fires before a document is unloaded. No Yes stop onstop Fires when the user stops loading the object. (unlike abort, stop event can be attached to document) No No HTML form beforeeditfocus
Ext JS is a composition of classes that has many capabilities. Some examples: an abstract layer for browsers (e.g. Ext.isArray that can be used as a replacement for Array.isArray)