Did you read the linked document??
Quote:
font-style: italic
font-weight: bold
The CSS properties for bolding and italics should be used whenever the use of bolding and italics is presentational (for example, on headings and lead-in words). CSS formatting carries no semantics, so the emphasis will not be noted by assistive technologies.
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Eg you must use the proper html tags if you want the assistive device to recognize it properly… css styling alone does not cut it.
Edit for clarification:
CSS properties (italic/bold) are for presentation (visual appeal). The html tags are what trigger the assistive technology. You can add other css styling to describe elements of the ‘voice’ but italic/bold in and of themselves in css don’t mean anything to accessibility devices.