How to get the number of DOM elements used in a web page

Question

Using jQuery I can easily get the number of DOM elements used by a web page:

$('*').length; 

But not all web sites are using jQuery.

So my question is: How do I get the number of DOM elements used in a web page using pure JavaScript and js console.

Answer 1

Assuming you mean "HTMLElementNodes" as opposed to "All nodes" (which would include such things as text nodes and also be skipped by your jQuery example) then:

document.getElementsByTagName('*').length 

This still requires the use of DOM though. Pure JavaScript can't interact with an HTML document other than as a string of text.