separator for import statement

What characters are allowed between the import statement and the module string?


Tested Browsers:
o) Chrome
o) Firefox
o) Edge
o) Safari

Note: Not all tested browsers were up to date so there could be some results, which do not work in the latest version


Test case:

<script type="module">
import*chr*"data:text/javascript,alert(123)"
</script>


Results:

Chars valid in all browser:
[0x09,0x0a,0x0b,0x0c,0x0d,0x20,0xa0,0x1680,0x2000,0x2001,0x2002,0x2003,0x2004,0x2005,0x2006,0x2007,0x2008,0x2009,0x200a,0x2028,0x2029,0x202f,0x205f,0x3000,0xfeff]

Safari + Edge = [0x180e]

Firefox = [0xfffe,0x1000c]