another: how does the DOM level description in P6-P7 in elevation be understood with an example?
another: how does the DOM level description in P6-P7 in elevation be understood with an example?
you don't have to understand it. Dom0 is a factual "specification", that is, when there is no specification, browsers have done so, so it has become a reality. Taking this as a starting point, it is called dom0.
dom1/dom2/dom3 is the official specification of different periods, just like js developed to ES7, 8, and so on, just like ES6 compared ES5 to add declaration keywords such as const/let, added something new, and these new dom-related syntax is added in dom2/dom3.
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