Do you select text as you read on the web? Who doesn't?
With a tweak dropped from the CSS3 standard but already in many a browser, you can make that highlighting on your site a, well, highlight: the ::selection pseudo-element lets you define fore- and background colors for highlighted text.
While it's probably best not to meddle with text selection in browsers, having to meddle with selecting text and changing its formatting every time you compose an email in Windows Live Hotmail is not good; it's not necessary either:
›› Yearning for a bigger font and different color in your emails but weary of changing the formatting for each new message you compose? Here's how to change the default font face, color and size for writing mail in Windows Live Hotmail.