High Contrast Testing
Operating System Features
- Microsoft Windows 10
- Shortcut Key: Press the left Shift, left Alt and Print Screen keys at the same time.
- Ease of Access: Select high contrast theme.
- Apple OSX
- Accessibility (in Preferences): Select 'Display" option and select high contrast options.
Browser Techniques
- Firefox
- Disable stylesheets using the "View -> Style -> No Style" menu options.
- Chrome
- High Contrast Extension
WCAG 2.0 Color Requirements
- 1.4.1 Use of Color
- Color is not used as the only visual means of conveying information, indicating an action, prompting a response, or distinguishing a visual element. (Level A)
- Note: This success criterion addresses color perception specifically. Other forms of perception are covered in Guideline 1.3 including programmatic access to color and other visual presentation coding.
- 1.4.5 Images of Text
- If the technologies being used can achieve the visual presentation, text is used to convey information rather than images of text except for the following: (Level AA)
- Customizable: The image of text can be visually customized to the user's requirements
- Essential: A particular presentation of text is essential to the information being conveyed.
- Note: Logotypes (text that is part of a logo or brand name) are considered essential.