javascript - Why does setting a new attribute initiate a FOUC? -


i'm using element.setattribute set element's href attribute after user input.

i noticed if set href on pageload (before user input) placeholder value (e.g. empty string), setting attribute works expected.

if don't set placeholder href initially, setattribute has create attribute, , see fouc in button text.

as far know, setattribute doesn't trigger reflow or repaint of dom or element.

here's looks like:

enter image description here

i understand how fix -- i'm curious why happens. can tell me what's going on under hood?


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