JSFiddle - React, Tailwind, and code Playground

HTML

<p id="test-1-1">
        <code>selector { property: value\0/; }</code>
    </p>
    <p id="test-1-2">
        <code>selector { property:value \0/; }</code>
    </p>
    <p id="test-1-3">
        <code>selector { property: value \0; }</code>
    </p>
    <p id="test-1-4">
        <code>selector { property: value \9; }</code>
    </p>
    <p id="test-1-5">
        <code>selector { property: value\9; }</code>
    </p>

CSS

#test-1-1 { background-color: lime; }
    #test-1-2 { background-color: lime; }
    #test-1-3 { background-color: lime; }
    #test-1-4 { background-color: lime; }
    #test-1-5 { background-color: lime; }
    
    #test-1-1 { background-color: red\0/; }
    #test-1-2 { background-color: red \0/; }
    #test-1-3 { background-color: red \0; }
    #test-1-4 { background-color: red \9; }
    #test-1-5 { background-color: red\9; }