How to catch multiple blocks with "scrl" tag via getElementsByTagName('scrl')?

Question

JavaScript

Hello, I need to catch and rewind up all blocks with the tag "scrl". I have a lot of them.

Here is the code that is supposed to catch them

window.onload = function()
{
 document.getElementsByTagName('scrl').scrollTop = 9999;
}

But it doesn't catch. If we replace the scrl tag with id='scrl' and catch via getElementById - it catches, but only the first one. Why doesn't it catch by tag name? Thank you.