I is for italics
The "i" element is for stylistically treating a word or phrase as being somehow different from the rest, by using an italicized variant of the font.
Possible uses might include a taxonomic designation, a technical term, an idiomatic phrase from another language, a thought, a ship name, etc.
The "i" element may be used for any span of text whose typographic presentation should be italicized.
Here italicized is not the same as emphasis as used in the "em" element.
- The "b" element is for stylistically treating a word or phrase as being somehow different from the rest, by using a heavier font weight than the surrounding text.
- The "em" element is for emphasizing a word or phrase within a sentence, suggesting that the reader should use an emphatic tone of voice.
- The "strong" element is for indicating that a word or phrase within a sentence has strong importance, urgency or seriousness.