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Asked: 2026-05-26T17:05:24+00:00

My questions are simple: Is the following valid? If it is, would it break

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My questions are simple:

Is the following valid? If it is, would it break in some browsers?

<div data-text="Blah blah blah
More blah
And just a little extra blah to finish"> ... </div>

Which characters “must” be encoded in attribute values? I know " should be &quot;, but are any others required to be encoded?

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  1. Editorial Team

    Is the following valid?

    It’s a valid fragment of HTML5, yes.

    would it break in some browsers?

    Unlikely.

    Which characters “must” be encoded in attribute values? I know " should be &quot;, but are any others required to be encoded?

    That depends on whether the attribute value is double quoted, single quoted or unquoted.

    For the double quoted form " must be replaced by its character reference, and & may need to be replaced by its character reference depending on the characters that follow it. See attribute-value-double-quoted-state

    For the single quoted form ' must be replaced by its character reference, and & may need to be replaced by its character reference depending on the characters that follow it. See attribute-value-single-quoted-state

    For the unquoted form TAB, LINEFEED, FORMFEED, SPACE, > must be replaced by their character references, and & may need to be replaced by its character reference depending on the characters that follow it. See attribute-value-unquoted-state

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