What is a potential issue when unicode font styles are not used?

Using Unicode font styles is crucial for ensuring that text is accurately represented across different platforms and devices. When Unicode is not utilized correctly, characters may not be rendered as intended, leading to misinterpretation of content. This misinterpretation can significantly hinder the functionality of assistive technologies, such as screen readers, which rely on properly encoded text to convey information accurately to users with disabilities. If the characters are not recognized, essential content might be omitted or incorrectly interpreted, disrupting the user's ability to access information effectively.

In contrast, while other options like text size, color rendering, and formatting can present challenges in document accessibility, they do not directly impact the fundamental integrity of the characters themselves. Therefore, ensuring the use of Unicode is vital for maintaining clear communication and accessibility for all users.