"Use abbreviations and acronyms only when they are widely understood by users and are significantly shorter than the full text" is not a guideline for displaying text.

Question

Quizplus · Accepted Answer

This is actually one of the guidelines for writing for the web, as it relates to making text easier to read and understand. However, it is not a guideline for displaying text specifically.

"Use Abbreviations and Acronyms Only When They Are Widely Understood