title: How to replace text without making following content "jump"?
body: <p>I have web page and in the middle of it is a paragraph of text. I want to replace the text when the user hovers the cursor over an image, but I don't want the page to seem to jump around and there are several possible texts - of differing lengths.</p>
  
  <p>I guess that that means that I need to reserve a fixed size are for the text, but which? </p>
  
  <p>There are not so many texts, just a handful, so I don't need to write any code to determine the size of the largest, I can just do it manually. But what's a good container for the text to that replacing it does not make the page contents after either jump up or down owing to difference of length of old &amp; new text?</p>