To get HTML element via aria label with JavaScript, we use the querySelector or querySelectorAll methods.

For instance, we write

const element = document.querySelector('[aria-label="Message Body"]');

to select the first element with the aria-label attribute set to Message Body.

Likewise, we write

const list = document.querySelectorAll('[aria-label="Message Body"]');

to select all the elements with the aria-label attribute set to Message Body returned in a node list.