devtools - each tag

// note: document.get_elementByTagName returns HTMLCollection which is not an array, and does not implement foreach(). 
// ... turns htmlcolleciton into an array. Array.from(a) would do same here. 
// This also an example of design decision that did not age well.
// ref: https://stackoverflow.com/questions/22754315/for-loop-for-htmlcollection-elements/22754453 or so.

[...document.getElementsByTagName('img')].forEach(a=>console.log(a.style.visibility='hidden'))

[...document.getElementsByTagName('img')].forEach(a=>console.log(a.style.height='100px'))

[...document.getElementsByTagName('img')].forEach(a=>my_function(a))