If you are in the web design industry, you are most likely suffering cross browser compatibility issues in HTML4. It is a luxury dream of every web developer to write once and run on any browser, and certainly we hope that we have learnt our lesson and not suffer again in HTML5.
History tells us, we as human, will repeat history, for example, have a look at my previous blog about HTML 5 Form Elements Demo Firefox already doesn’t support some of the elements. Another example, location detection, Firefox provides more user options than other browsers(eg. Chrome) which makes implementation extremely difficult.
Due to fragmentation like this, we are forced to skip this location feature in our next software release, hopefully we can come up a better approach before the next release.