Why does HTML require that multiple spaces show up as a single space in the browser?

Spaces are compacted in HTML because there’s a distinction between how HTML is formatted and how it should be rendered. Consider a page like this:

<html>
    <body>
        <a href="https://stackoverflow.com/questions/433493/mylink">A link</a>
    </body>
</html>

If the HTML was indented using spaces for example, the link would be preceded by several spaces.

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