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I am learning about AngularJS and see it adds some of its own attributes that nor start with data neither are standard html tags attributes, like this:
<html ng-app>
or this:
<body ng-controller="PhoneListCtrl">
Where from do these ng-* attributes come and is that a valid HTML? Where can I read more about this?
Strictly speaking these extra attributes are not defined in the HTML specifications thus, are not valid HTML. You could say that AngularJS provides and parses a superset of the HTML specification.
However, as of v1.0.0rc1, you could use data-* attributes, for example
<html data-ng-app>which, I believe, are valid HTML5. Source.There is a guide to the AngularJS Compiler that contains some more information on the process. In short; the AngularJS compiler reads your HTML page, using these attributes to guide it as it edits and updates your page, after loading, via javascript and the HTML DOM.