How can I underline all rows in textarea?

Question

How can I underline all rows in textarea?

I need in something like this.

P.S. Textarea has style padding: 10px

I can\'t you background,

Answer 1

Short answer, it's not possible to format text inside a textarea.

If this is really important I'd suggest using

which allows you to style the text (but it's open to potential abuse from pasted HTML), and then parse our innerHTML to a hidden input field upon submitting your form.