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Comment: Clarified legacy percent encoding of form submissions in HTML 4.01.

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Percent Encoding for application/x-www-form-urlencoded

The HTML 4.0.101 specification indicated that percent-encoding of any non -ASCII alphanumeric characters of application/x-www-form-urlencoded (the default content type for HTML form submissions) should be performed using US-ASCII byte sequences. However HTML 5 changed this to use UTF-8 byte sequences, matching the modern percent encoding for URLs. Modern browsers therefore percent-encode UTF-8 sequences when submitting forms using application/x-www-form-urlencoded.

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