Question

Which of the following handles painting the content on to the screen?

(a) Rendering engine

(b) JavaScript Interpreter

(c) UI Layer

(d) Network Layer

I had been asked this question during an interview.

Asked question is from Page Render BottleNecks Optimization topic in section Invocation and Performance Navigation of JavaScript

Answer 1

Right answer is (a) Rendering engine

To elaborate: A rendering engine is a software that draws text and images on the screen. The rendering engine handles painting the content to the screen. When it encounters JavaScript, it hands it off to the JavaScript interpreter.