Is it possible to adapt font size to div width with CSS?

Question

I have a div with 70% width, and here’s what I want to do:

• Put some words in that div
• Adapt font size so that those words occupy all div

Answer 1

Perhaps not quite what you're looking for, but something - You can make both the font and the element relative to view width.

p {
  font-size: 5vw;
  background-color: red;
  width: 50vw;
}

  I'm a P!