Javascript HTML string.?

[Bob J]

I have an input box with an I.D. of "q" on my website...

By entering javascript into the URL bar I can change the place holder text (client side) to say "test"

javascript:void(document.getElementById('q').value='test');

Now if I wanted to make it say test (but in bold with html) how would I do that??
I tried:

javascript:void(document.getElementById('q').value='<b>text');

But that won't work.. it's a string! I don't know much javascript...

Thanks all!
javascript:void(document.getElement ById('q').value='test');