HTML5 & JavaScript relation

[JAB Creations]

I see a bit of JavaScript related work mixed with HTML5 and I'm wondering what the relationship is exactly?

[zcorpan]

JavaScript is defined in ECMA-262, and work on JavaScript happens in TC39. HTML5 specifies that 'this' refers to the WindowProxy object instead of the global object, and has special rules for document.all that affects JavasScript implementations, but otherwise doesn't extend or change JavaScript.

HTML5 (and other specs) have a number of DOM APIs that via WebIDL gets exposed in JavaScript.

[JAB Creations]

So would it be more accurate to say that HTML5 clarifies ambiguities between HTML/DOM/JavaScript?

[zcorpan]

WebIDL specifies the mapping between DOM and JavaScript, so there shouldn't be any ambiguities. HTML5 mostly extends HTML and the DOM and specifies in more detail the features that were in previous HTML and DOM specs.