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When I was 12, I invented my own tag called <t> (I wanted something with no default styling but I didn't know how to do it).

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What year was that? The custom tags thing used to have a lot more problems than it does now.

Browsers have always been lenient towards errors in markup. Unknown elements would just be rendered as <p> or <span> (can't remember which).

Much later this was codified in HTML 5: if a browser doesn't know an element, it will render it as basically a span (that is, inline element with default styling IIRC).

Up to IE7, non-standard elements couldn't be styled without a shiv.

My memory doesn't extend that far back :) Even though I've been "in the biz" since early 2000s

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