Checkpoints - Do not use italic <i> tags to emphasize text
The <i> element only affects the visual presentation of the text, and does not convey semantic meaning. It can be used as a span of text in an alternate voice or mood or otherwise offset from the normal prose in a manner indicating a different quality of text, such as a taxonomic designation, a technical term, an idiomatic phrase from another language, transliteration, a thought, or a ship name in Western texts. Semantic markup such as <em> and <strong> can be used to mark emphasized or important text so that it can be programmatically determined. Some assistive technologies provide a mechanism for determining the characteristics of content that has been created using proper semantic markup.
Accessibility (WCAG 2 Level A, 1.3.1)
The checkpoint examines the entire HTML source code of a page and reports if any <i> elements are found.