[markdown] How to apply color in Markdown?

Short story: links. Make use of something like:

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a[href='red'] {
    color: red;
    pointer-events: none;
    cursor: default;
    text-decoration: none;
}
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<a href="red">Look, ma! Red!</a>
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(HTML above for demonstration purposes)

And in your md source:

[Look, ma! Red!](red)