javascript - Relation between Ecmascript and the window object -


i know window object current browser has offer far functionality concerned.

but how ecmascript related this? how included in browser, , how know browser loads version of ecmascript?

for example, here ecmascript 5 object properties. how supposed know if it's supported in current browser instance?

you can resort feature testing e.g.

var preventextensionsupport = !!object.preventextensions; var ownpropertydescriptorsupport = !!object.getownpropertydescriptor

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