tooltip is set but not displayed in firefox, javascript

Question

Can any body please help me why the tooltip is not getting displayed in firefox when it is set using title attribute for <a> element while it works with InternetExplorer. title is set but still not getting displayed.

Answer 1

Simply put, the HTML spec does not specify what the browser behavior for setting the title attribute on the a element should be.

The makers of IE decided to display a tooltip, the makers of Firefox didn't, in early versions.

You can see that in a current version of Firefox, tooltips work as you expect if you hover over the names in the comments on this site.

From the spec:

This attribute offers advisory information about the element for which it is set.

And:

Values of the title attribute may be rendered by user agents in a variety of ways. For instance, visual browsers frequently display the title as a "tool tip"

As you can see, the tooltip is not mandated, only suggested as an example.