Question

What will happen after executing the script?

(a) Execute script

(b) Layout positioning of DOM elements

(c) Paint DOM elements

(d) Build DOM nodes in render tree

I got this question in an interview for job.

Enquiry is from Page Render BottleNecks Optimization in chapter Invocation and Performance Navigation of JavaScript

Answer 1

The correct choice is (d) Build DOM nodes in render tree

Explanation: After executing the script, the DOM nodes will be built in the render tree. The Render engine workflow contains:

Parse Content

Build DOM nodes in render tree

Layout positioning of DOM elements

Paint DOM elements.