Do I encode ampersands in ?

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Yes, it is. HTML entities are parsed inside HTML attributes, and a stray & would create an ambiguity. That’s why you should always write & instead of just & inside all HTML attributes.

That said, only & and quotes need to be encoded. If you have special characters like é in your attribute, you don’t need to encode those to satisfy the HTML parser.

It used to be the case that URLs needed special treatment with non-ASCII characters, like é. You had to encode those using percent-escapes, and in this case it would give %C3%A9, because they were defined by RFC 1738. However, RFC 1738 has been superseded by RFC 3986 (URIs, Uniform Resource Identifiers) and RFC 3987 (IRIs, Internationalized Resource Identifiers), on which the WhatWG based its work to define how browsers should behave when they see an URL with non-ASCII characters in it since HTML5. It’s therefore now safe to include non-ASCII characters in URLs, percent-encoded or not.

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