* innerHTML
* css applied to chrome
* XMLHttpRequest
* i18n DNS
* double-byte char support (since 96)
* embed (or was it object? one of the two - the first one)
* first video embed (IE2 on Mac)
* hasLayout
* iframe
* marquee (for the lolz)
* contenteditable
* opacity/filter
* favicons
* first implementations of CSS, tables, 128-bit ssl, xml (5) and xstl (5)
It works better when coders who build browsers decide new features, not some guys sitting around a table trying to agree on what an image display should look like.
Exactly what Andreessen did, he just added stuff to Netscape and let the loonies complain about it not being 'proper'. We criticize Microsoft for the same thing.
People don't complain about Intel and AMD with instruction set standards, but they complain about web standards because it is easy to.