HTML5 Font rendering is tricky. It is not consistent across browsers.
Read how MockupTiger fixed the font rendering issue. You will also notice that with the fix, it is now possible to add any of your favourite font for wireframes. Why just limit to Comic Sans or Arial. Try the Google web fonts for instance.
Try MockupTiger to build Wireframes for your next software prototypes or initial Mockups when you are just iterating over ideas.
MockupTiger Wireframes builds instant wireframes for your Dashboards or Oracle Forms