video codecs with adobe media encoder that are lossless: avi uncompressed, animation, quicktime PNG.
These are still only 8 bit but since you’re capturing web content, these should suffice.
You will still need a relatively fast HD to playback uncompressed footage. jpeg2000 lightly compressed handles poor video better than mpeg2, h.264, h.265.
My opinion is that quicktime PNG video codec would be smallest file size and best quality.