Reader’s advice: iframe bug in Firefox
This error occures in Firefox 22.214.171.124, both Win and Mac.
The workaround for the above is to set rule
position: absolute to an
iframe. No coordinates should be specified (
top), and the parent element should not be set to
position: relative, as this throws the
iframe back to square one.
Ed’s note: The bug has nothing to do with the ‘rounding error’.