javascript - script tag async attribute

Question

According to the picture, when the attribute is async, the loading of the document is suspended when the script is executed, but many texts explain that the downloading and execution of the script and the loading of the document are executed in parallel. Is there a difference between the two? ? ? Does document loading pause when the script is executed? ? ?

Answer 1

Answer 2

Clearly, when a script that does not set the async attribute is executed, it will block the browser from rendering the page
On the contrary, the (loading and) execution of the async script does not affect the rendering of the page