[css-text-decor] Use RFC2119 SHOULD.

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extra : rebase_source : eb123b7b9292743ecfc2369dce4e91bba6a9fc9a
[css-text-decor] More introductory text for text-emphasis

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extra : rebase_source : 65a6cf3cfd8c2082b820db8c0566cb2bff26762d
[css-text-decor] Define painting order of text decorations. See <http://lists.w3.org/Archives/Public/www-style/2013Mar/0527.html>, <http://lists.w3.org/Archives/Public/www-style/2013Mar/0526.html>, <http://lists.w3.org/Archives/Public/www-style/2013Mar/0525.html>

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extra : rebase_source : 267417db11a59d50cb85fc51b16462c5a3bdfa03
[css-syntax] Fold number-fraction into number-rest, since the sole difference was the treatment of '.'.

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extra : rebase_source : 12fd2e005f4d5481e664de4357f3c4c3f76e0e4d
[css-syntax] Just move the scinot state up, next to number-rest, as it's now properly a number state.