tooltip is set but not displayed in firefox, javascript [closed]

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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.

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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.