About HTML Preprocessors. I want to add a letter as a placeholder text as an example. The problem is that when I make line breaks in it, they won’t display. Questions: I’m editing a textarea with JavaScript. When we use textarea to edit text in the foreground and submit it to the background in JS, space and line feed are the most important issues we need to consider. HTML5 introduced a few new attributes which can be used with textarea elements. I found this highly confusing as. The