0x00 byte (%00) in a data: URL

[annevk]

Briefly looking into https://bugs.webkit.org/show_bug.cgi?id=21975 I noticed that user agents vary in behavior for these two data: URLs:

1. data:text/html,a%00a
2. data:text/html,a%01a

In 1 it seems the 0x00 byte gets dropped completely.

This seems specific to data: URLs processing as %00 remains part of the URL. And for fragment navigation for instance it's not dropped, compare https://whatwg.org/stages#stage%000 and https://whatwg.org/stages#stage0.