Question

Is there any way to put formatting inside a multiline textbox? It cannot be applied to the whole box.
If not, is there a way to make any other text element such as description to be selectable and copy-able?

For example:

<textbox multiline="true">
    <description style="color: red;">This should be red</description>
</textbox>

Answer 1

Actually I misunderstood your question. If you just want to be able to select from a <description> element, just set the -moz-user-select: text style on it. (You might want to set the cursor too.) Copying is slightly harder though, since you have to handle the keypress/context menu yourself.