Situation A: text is less than 18 point if not bold and less than 14 point if bold G18: Ensuring that a contrast ratio of at least 4.5:1 exists between text (and images of text) and background behind the text G148: Not specifying background color, not specifying text color, and not using technology features that change those defaults G174: Providing a control with a sufficient contrast ratio that allows users to switch to a presentation that uses sufficient contrast Situation B: text is at least 18 point if not bold and at least 14 point if bold G145: Ensuring that a contrast ratio of at least 3:1 exists between text (and images of text) and background behind the text G148: Not specifying background color, not specifying text color, and not using technology features that change those defaults G174: Providing a control with a sufficient contrast ratio that allows users to switch to a presentation that uses sufficient contrast Advisory Techniques for Success Criterion 1.4.3 G156: Using a technology that has commonly-available user agents that can change the foreground and background of blocks of text Failures for Success Criterion 1.4.3 F24: Failure of Success Criterion 1.4.3, 1.4.6 and 1.4.8 due to specifying foreground colors without specifying background colors or vice versa F83: Failure of Success Criterion 1.4.3 and 1.4.6 due to using background images that do not provide sufficient contrast with foreground text (or images of text) Back to top 1.4.4 Resize Text Level AA Except for captions and images of text, text can be resized without assistive technology up to 200 percent without loss of content or functionality. Understanding 1.4.4 Show Hide techniques and failures for 1.4.4 Sufficient Advisory Failures Sufficient Techniques for Success Criterion 1.4.4 Note: Other techniques may also be sufficient if they meet the success criterion. See Understanding Techniques. G142: Using a technology that has commonly-available user agents that support zoom Ensuring that text containers resize when the text resizes AND using measurements that are relative to other measurements in the content by using one or more of the following techniques: C28: Specifying the size of text containers using em units Techniques for relative measurements C12: Using percent for font sizes C13: Using named font sizes C14: Using em units for font sizes Techniques for text container resizing SCR34: Calculating size and position in a way that scales with text size G146: Using liquid layout G178: Providing controls on the Web page that allow users to incrementally change the size of all text on the page up to 200 percent G179: Ensuring that there is no loss of content or functionality when the text resizes and text containers do not change their width Advisory Techniques for Success Criterion 1.4.4 C17: Scaling form elements which contain text C20: Using relative measurements to set column widths so that lines can average 80 characters or less when the browser is resized C22: Using CSS to control visual presentation of text Failures for Success Criterion 1.4.4 F69: Failure of Success Criterion 1.4.4 when resizing visually rendered text up to 200 percent causes the text, image or controls to be clipped, truncated or obscured F80: Failure of Success Criterion 1.4.4 when text-based form controls do not resize when visually rendered text is resized up to 200% F94: Failure of Success Criterion 1.4.4 due to incorrect use of viewport units to resize text Back to top 1.4.5 Images of Text Level AA 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: 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 1: Logotypes (text that is part of a logo or brand name) are considered essential.