Experimental evaluation of usability and accessibility of heading elements

Area of Science:

• Web usability and accessibility research.
• Human-computer interaction.
• Digital inclusion studies.

Background:

• Web content structure significantly impacts user navigation and task efficiency.
• Accessibility for visually impaired users relies on semantic markup for screen reader navigation.
• Heading elements provide hierarchical structure crucial for understanding web page content.

Purpose of the Study:

• To investigate the impact of properly marked-up heading elements on website usability and accessibility.
• To compare task completion times and user satisfaction between structured and unstructured web pages.
• To assess differences in usability and accessibility improvements for sighted versus blind users.

Main Methods:

• Comparative usability testing with sighted and blind users on two sets of websites: one with marked-up headings and one without.
• Data collection included task completion times and user satisfaction questionnaires.
• Experiment utilized user agents capable of navigating via heading elements.

Main Results:

• Marked-up heading elements significantly reduced task completion times for both sighted and blind users.
• User satisfaction was higher for websites with structured heading elements.
• No significant difference in accessibility improvement (task completion time reduction) was observed between blind and sighted users, potentially due to efficient navigation strategies employed by blind users.

Conclusions:

• Properly marked-up heading elements, combined with user agents that utilize structural markup and knowledgeable users, enhance website usability for all users.
• This combination may also lead to improved accessibility for blind users.
• Optimizing web structure is key to improving the digital experience for diverse user groups.