HTML and CSS Certification Practice Test 2026 - Free HTML and CSS Practice Questions and Study Guide

The statement that a CSS comment starts with /* and ends with */ is accurate because this is the correct syntax for writing comments in CSS. Comments in CSS are used to make notes or add explanations within the stylesheet without affecting the style the CSS applies to the HTML.

When you write a comment using the /* and */ delimiters, the content within is completely ignored by the browser during rendering. This allows developers to provide context or reminders for themselves or others who may work on the code later, without impacting the performance or appearance of the webpage.

The other options outlined are incorrect. For example, the use of # derives from other programming languages, notably CSS preprocessors like SASS; however, this syntax is not valid for CSS comments. Moreover, the use of // is common in languages like JavaScript for single-line comments, but again, it does not apply in CSS. The last statement regarding a comment starting with . is incomplete and does not represent valid syntax for CSS comments.