Title: Repeat it with me, avoid these old HTML tags!
Course: Accessibility 102 > Section: Links and text

The basefont tag should not be used.
Check out this not so accessible bold writing. The reason for this is that bold provides no semantical emphasis, only visual emphasis, as such strong is better suited.
Same reason goes for the italics tag, use em for emphasis instead.
Strike-through text should use the del for deleted text instead.
The blink tag should not be used. No. Never.
I think this proves the point well enough about not using the marquee tag ever!