Problems with the Unicode Table

The following scripts are too big to be conveniently rendered
CJK Unified Ideographs Extension A CJK Unified Ideographs Hangul Syllables CJK Unified Ideographs Extension B
JavaScript doesn't support high Unicode
That is, characters whose Unicode number is (hexadecimal) 0x100000 or higher. This happens on every version of JavaScript I've tested, although the manuals say nothing about such a limitation.
This script isn't in the standard
"Specials" before Halfwidth & fullwidth forms