2.2.15 [CSS-Level2-2009] Section 16.6.1, The 'white-space' processing model

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C0024:

The specification states:

 4. If spaces (U+0020) or tabs (U+0009) at the end of a line have 'white-space' set 
 to 'pre-wrap', UAs may visually collapse them.

IE8 Mode and IE9 Mode (All Versions)

When the white-space property is set to pre-wrap, spaces and tabs at the end of a line are NOT collapsed.