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`<` is highlighted as error in quoted value
From https://github.com/microsoft/vscode/issues/160143
<
is highlighted as an error.
Reading https://dev.w3.org/html5/spec-LC/syntax.html#attributes-0 I don't think <
in a quoted attribute value is a problem:
Attribute values are a mixture of text and character references, except with the additional restriction that the text cannot contain an ambiguous ampersand.
Single-quoted attribute value syntax The attribute name, ... followed by the attribute value, which, in addition to the requirements given above for attribute values, must not contain any literal U+0027 APOSTROPHE characters ('), and finally followed by a second single U+0027 APOSTROPHE character (').
Double-quoted attribute value syntax The attribute name, ... followed by the attribute value, which, in addition to the requirements given above for attribute values, must not contain any literal U+0022 QUOTATION MARK characters ("), and finally followed by a second single U+0022 QUOTATION MARK character (").