Let's say, I've got something like this:
<div id="some_id">
<img src="url1" id="el_id1" hidden>
<img src="url2" id="el_id2" hidden>
<img src="url3" id="el_id3" hidden>
</div>
And now, I need javascript to delete all this "hidden" attributes. I don't know the exact ids, I just know they all begins with prefixes of "el_id". How can I realize it using pure javascript?