Use of underscore in CSS ids should be discouraged

Use of underscore in CSS ids should be discouraged


Underscore "_" should not be used in CSS class names and ids.
At least ui.datepicker.js has this bad habit. Use dash "-" instead.
http://devedge-temp.mozilla.org/viewsource/2001/css-underscores/
"This was not well supported by browsers at the time, however, and the
practice has never caught on. CSS2, published in 1998, also forbade
the use of underscores in class and ID names. However, errata to the
specification published in early 2001 made underscores legal for the
first time. This unfortunately complicated an already complex
landscape."