Underlining a Word in Storyline

I don’t think this is possible using Storyline’s default functionality. However, it can be achieved with JavaScript by targeting a specific word or object via its data-model-id or data-acc-text attribute and applying a different color defined in the script.

See the example below and the attached Storyline file for reference.

If only a single word or an entire sentence needs to be underlined, a JavaScript-based solution is fairly straightforward. However, if multiple or non-consecutive words need to be underlined, the implementation becomes more complex. In such cases, I recommend using JavaScript only when a single word or full sentence requires a different underline color. For more complex scenarios, a simpler and approach is to draw line shapes under each word directly in Storyline.

EDIT:
You can also underline multiple or non-consecutive words by adjusting the JavaScript, as long as they belong to a single object or text box.