What is a common accessibility issue with videos?

Lack of captions or transcripts for audio is a prevalent accessibility issue with videos because it directly affects individuals who are deaf or hard of hearing. Captions not only enable these individuals to access the spoken content of a video but also convey important non-dialogue audio information, such as sounds and music, which can enhance the understanding of the context and emotional tone of the video.

Transcripts serve a similar purpose by providing a textual representation of all spoken content and essential audio cues in the video. Without these accommodations, people with hearing impairments are left unable to fully engage with or comprehend the material being presented, which can lead to significant barriers to learning and information access.

While the other options pertain to different aspects of audio-visual content, they do not broadly impact accessibility as significantly as the absence of captions or transcripts. For instance, excessive background music is primarily a comfort issue rather than an accessibility barrier, and while unclear visual content can pose challenges, they do not directly exclude audiences based on a disability like hearing loss does. High-definition graphics may lead to performance issues but are not necessarily an accessibility issue in the same way that a lack of captions is.