 which are recognized as whitespace by JS,
are not valid whitespace in CSS.
-->

<script>

function isWhitespace(codepoint) {
    const char = String.fromCodePoint(codepoint);
    const codepointName = "U+" + codepoint.toString(16).padStart(4, "0");
    test(()=>{
        const withSpace = document.querySelector(".a b");
        const withChar = document.querySelector(`.a${char}b`);
        assert_equals(withSpace, withChar);
    }, `${codepointName} is CSS whitespace`);
}
function isNotWhitespace(codepoint