webkit-clip-path:inset(4px); trims 4px of all edges in Chrome, but I haven't gotten anything to work in FF. I've tried with/without prefix, all values written out with commas/spaces. Most tutorials say it's supported but there's very little info on FF. One briefly mentioned using an svg type of url filter but didn't explain it all.
Is this a case where FF just makes something far more difficult than it needs to be, or is it something that doesn't work at all? Hopefully it's a simple syntax error on my part. TIA for any help.