What is the effect of the async attribute on script tags?

Question

Accepted Answer

it allows the initial rendering of the page to not be blocked when the script is downloaded

Answer

it allows the execution of the script to be deferred after the DOMContentLoaded event on the document object

Answer

it allows the initial rendering of the page to not be blocked when the script is executed

Answer

it allows the execution of the script to be deferred after the load event on the window object

Question from the WebPerf test