Browsers set the measure of 1px in CSS as closely as possible to that of the reference pixel, which takes into account the assumed viewing distance. CSS Pixels The browser-calculated value of pixels, which may be different from the physical device pixels. There is a related concept in the ARIA graphics module for graphics with a document structure, but this applies to bitmap and vector graphics, or visual objects within them. It may be a component of a larger structured graphic such as a chart or map. Level AA Related Glossary additions or changes essential WCAG 2.0's definition of essential graphical object A graphic or section of a graphic that represents a distinct object or sub-component with semantic meaning. Logotypes: Graphics that are part of a logo or brand name have no minimum contrast requirement.

Sensory: Non-text content that is primarily intended to create a visual sensory experience has no minimum contrast requirement.

Thicker: where the minimum width and height of the graphical object is at least 3 CSS pixels the graphic has a contrast ratio of at least 3:1.The visual presentation of graphical objects that are essential for understanding the content or functionality have a contrast ratio of at least 4.5:1 against the adjacent color(s), except for the following: 10.1 Existing Relevant Techniques for 1.4.3.8.2 Notes on how the contrast and thickness were derived.5 What Principle and Guideline the SC falls within.

4 Related Glossary additions or changes.

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