Definition and Footnote

You can use the title attribute for definitions and footnotes which will appear when the user hovers over the text.

Use the code option of the Embed function:

<span style="border-bottom:thin dashed green" title=" Definition for Some Text ">Some Text</span>

or

Footnote<span style="color:red" title=" Footnote text ">[1]</span>

Note: Not all browsers will display the title attribute and not all screen readers will speak the text.