Which CSS white-space Property Values Don't Preserve Space?

This following CSS white-space property values do not preserve spaces:

• normal (default)
• nowrap
• pre-line

This means that when the CSS white-space property is set to any of these values, sequences of spaces will be collapsed into a single character, unless the collapsible spaces are at the beginning or end of a line (in which case they are removed). You can prevent this from happening if you use CSS white-space property values that preserve spaces.

Consider for example the following, where spaces are collapsed:

<span>foo</span> bar

span { border: 1px solid orange; }
span::after { content: ' '; }

This would result in only one space after "foo", instead of two.