Can a single character be underlined in alt text in img element

Question

We have a need to underline a character in a client's name. How do I do it in alt attribute of img element?

<img alt="ab<u>c</u>def" />
<img alt="ab&lt;u&gt;c&lt;/u&gt;def" />
<img alt="ab<span style='text-decoration:underline;'>c</span>def" />

I expect the output to be underlined 'c' but actual output is literal.

Answer 1

It can't. HTML entities don't work in tag attributes, only between tags.