How to output spaces in the JSF page

I am using seam as a website. In order to output spaces on the page, I thought it would be & nbsp;, but it would not work. If it was changed to "", it would only be a space. I have no idea why JSF doesn't need this question. Why ;? Do you want to develop your own standards? Or does & nbsp; have its shortcomings?
After some searching, we finally found out that JSF outputs spaces on the page. Code: & #160;
However, I still don't understand why JSF needs to set up standards like this, so that our developers can find it easily.