UTF-8 or (8-bit Unicode Transformation Format) is a variable width character encoding that is widely used for web pages today. It is also the recommended format to use when creating web pages by W3C. Using encoding in older formats are not suggested because they may not support all character types such as foreign language characters.
How can I resolve this issue?
Use the meta charset of your page to use utf-8
Example: <meta charset="utf-8"/>
What topics do this checkpoint affect?
Can you explain how this checkpoint works?
This checkpoint will look at the <head> section of a page and flag an issue if meta charset is not set to utf-8