This manifests with all versions of Webkit. You can use the following steps to
a) Open the attached HTML page.
b) Select any portion of the underlined text and click on the underline button.
c) The underline still persists.
Notes: The U tag (<u style="">) enclosing the SPAN negates the inline-style applied to the SPAN after the operation.
Created attachment 31654 [details]
The HTML file containing the reduction
*** This bug has been marked as a duplicate of 20215 ***