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I was reading the page about the Document Object Model on Wikipedia.
One sentence caught my interest; it says:
A Web browser is not obliged to use DOM in order to render an HTML
document.
You can find the entire context on the page right here.
I don’t understand that is there any other alternative to render an HTML document? What exactly does this sentence mean?
Strictly speaking IE (at least < IE9) does not use a DOM to render an HTML document. It uses its own internal object model (which is not always a pure tree structure).
The DOM is an API, and IE maps the API methods and properties onto actions on its internal model. Since the DOM assumes a tree structure, the mapping is not always perfect, which accounts for a number of oddities when accessing the document via the DOM in IE.