This issue was originally filed by sander.dijkhu...@gmail.com

The pages on dartlang.org use this tag to load Open Sans:

<link href='http://fonts.googleapis.com/css?family=Open+Sans' rel='stylesheet' type='text/css'>

This doesn't load the boldface file, while some parts like .intro > dl > dt are set in boldface. Currently this means that the regular font is made bold programmatically at these places, which looks very bad.

Instead, please use this tag:

<link href='http://fonts.googleapis.com/css?family=Open+Sans:400,700' rel='stylesheet' type='text/css'>