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by chrismorgan
1665 days ago
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False on two counts: 1. It doesn’t need to be a valid JavaScript identifier, though if it isn’t you’ll need to use subscripting syntax to access it: > document.body.id = "like-this";
> window["like-this"]
<body id="like-this">
2. It’s not added to the window object; rather, property lookup on a window object falls back to looking up elements by ID if there is no such property: > typeof example
"undefined"
> document.body.id = "example";
> example
<body id="example">
> example = "no longer an element";
> example
"no longer an element"
> delete example;
true
> example
<body id="example">
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