Given a preformatted text (one contained inside <pre>..</pre>), you can force the css drawn box to be smaller than the text playing with your brosers' window width. The expected behaviour is to have the drawn box at least as wide as the preformatted text, even if the browser's window is not wide enough to show the whole preformatted text. Looks like IE 5.5 get's this right.
Created attachment 67317 [details] Testcase Modify your browser's window width to make it smaller and see the box rendered incorrectly.
Build 2002020415 still shows the bug.
confirming the bug, setting to future, P4, already set to trivial
The width of a block (which is what blockquote is) depends on its parent only, not on its children. IE is implementing a weasel-hole in the CSS2 box model which basically says that any horizontal size you want is OK regardless of the CSS set on the element or any other criteria; that weasel hole is likely to be removed from the upcoming CSS 2.1.