Added 2 white-space tests related to multi-columns container #26912
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css/css-text/white-space/multi-columns-ws-nowrap-001.html
css/css-text/white-space/reference/multi-columns-ws-nowrap-001-ref.html
css/css-text/white-space/multi-columns-ws-pre-001.html
css/css-text/white-space/reference/multi-columns-ws-pre-001-ref.html
These 2 tests verifies how multi-column containers handle 'white-space: pre' and 'white-space: nowrap' when involved with atomic inlines (inline-blocks and inline-tables). These 2 tests expose some implementation failures in Firefox 86, Chromium 89 and Epiphany 3.32.1.2 (WebKitGTK+ 2.30.3).
It appears that browsers treat 'column-gap: 2em' as suppressible, cancelable white spaces.
Over at my website, these files are:
http://www.gtalbot.org/BrowserBugsSection/CSS3Text/multi-columns-ws-nowrap-001.html
http://www.gtalbot.org/BrowserBugsSection/CSS3Text/reference/multi-columns-ws-nowrap-001-ref.html
http://www.gtalbot.org/BrowserBugsSection/CSS3Text/multi-columns-ws-pre-001.html
http://www.gtalbot.org/BrowserBugsSection/CSS3Text/reference/multi-columns-ws-pre-001-ref.html