Solution: How to isolate a part of text that might be formatted in a different direction from other text outside it?

In the example below, usernames are shown along with the number of points in a contest.If the bdi element is not supported in the browser, the username of the Arabic user would confuse the text (the bidirectional algorithm would put the colon and the number "80" next to the word "User" rather than next to the word "points").

User hrefs: 40 points
User jdoe: 60 points
User ?????:80 points

Note: The bdi element is currently supported only in Firefox and Chrome.