[css2] Update section 8.3.1.

	modified:   css2/about.html
	modified:   css2/aural.html
	modified:   css2/box.html
	modified:   css2/cascade.html
	modified:   css2/changes.html
	modified:   css2/colors.html
	modified:   css2/conform.html
	modified:   css2/cover.html
	modified:   css2/fonts.html
	modified:   css2/generate.html
	modified:   css2/grammar.html
	modified:   css2/indexlist.html
	modified:   css2/intro.html
	modified:   css2/leftblank.html
	modified:   css2/media.html
	modified:   css2/page.html
	modified:   css2/propidx.html
	modified:   css2/refs.html
	modified:   css2/sample.html
	modified:   css2/selector.html
	modified:   css2/syndata.html
	modified:   css2/tables.html
	modified:   css2/text.html
	modified:   css2/ui.html
	modified:   css2/visudet.html
	modified:   css2/visufx.html
	modified:   css2/visuren.html
	modified:   css2/zindex.html