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There was a time when you could do this in JS:
document.body.innerHTML = "Hello World".fontsize(7);

And it would write this into the body:
<font size="7">Hello World</font>

Actually, that time is now. You can still do this, although it's deprecated, along with a bunch of really intriguing String methods like String.big(), String.anchor(), String.blink(), String.italics(), and more.