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Editorial Team
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Asked: 2026-05-17T19:12:22+00:00

I’m tring to create form validation unit that, in addition to regular tests checks

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I’m tring to create form validation unit that, in addition to “regular” tests checks
encoding as well.

According to this article http://www.w3.org/International/questions/qa-forms-utf-8 the
allowed characters are CR, LF and TAB in range of 0-31, the DEL=127 in not allowed.

On the other hand, there are control characters in range 0x80-0xA0. In different sources
I had seen that they are allowed and that not. Also I had seen that this is different
for XHTML, HTML and XML.

Some articles had told that FF is allowed as well?

Can someone provide a good answer with sources what can be given and what isn’t?

EDIT: Even there http://www.w3.org/International/questions/qa-controls some ambiguity

The C1 range is supported

But table shows that they are illegal and previous shown UTF-8 validations allows them?

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1 Answer

  1. Editorial Team

    The Unicode characters in these ranges are valid in HTML 4.01:

    0x09..0x0A
0x0D
0x20..0x7E
0x00A0..0xD7FF
0xE000..0x10FFFF

    In XHTML 1.0… it’s unclear. See http://cmsmcq.com/2007/C1.xml#o127626258

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