<i> - HTML 5

The <i> tag defines a part of text in an alternate voice or mood. The content of the <i> 
tag is usually displayed in italic.
The <i> tag can be used to indicate a technical term, a phrase from another 
language, a thought, or a ship name, etc.
Use the <i> element only when there is not a more appropriate semantic element, such as:

<em> (emphasized text)
<strong> (important text)
<mark> (marked/highlighted text)
<cite> (the title of a work)
<dfn> (a definition term)

Syntax

    <p>He named his car <i>The lightning</i>, because it was very fast.</p>

Example

    <p>He named his car <i>The lightning</i>, because it was very fast.</p>

Output / Return Value

Limitations

Alternatives / See Also

Reference