[TruthWillWin]

If you want the readers' browser to set the width, you are better off just abandoning the

 method, and inserting 

at the end of each paragraph.

And "br" at each line to prevent long lines.

[Cboldt]

I only use <br> when I want a line break without a blank line following - like if I want a short line within a paragraph. If you use one <br> at the end of a long line, it is still a long line, and under <pre>, will go past the right margin.

A <p> will put in a line break plus a blank line (empty line between paragraphs), and will cause the preceeding line or lines to fill the (variable) paragraph width in each browser.