Focal length of lens formula

The algorithm used in this tool and subsequent results are based on the text luminosity algorithm recommended in the WCAG 2 guidelines to test for contrast. This tool is for general assessment purposes only and not a guarantee of conformance/compliance.

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And while having a great scanner is key, having a platform that makes sense of the results is crucial. No other platform can provide context and clarity to accessibility findings, with greater visibility to the history of issues identified.

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What is focal length of lens

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The compliance rate shown above is the highest compliance rate met. The WCAG 2 level AA and Section 508 refresh compliance level is based on achieving a contrast ratio of 3:1 for text with a size of 18 points (14 points if bolded) or larger or 4.5:1 for text with a size less than 18 points. The WCAG 2 level AAA compliance level is meet when a contrast ration of 7:1 is achieved for text less than 18 points and 4.5:1 for text 18 points (14 points if bolded) or larger.

Enter a foreground and background color in #hex or RGB integer format to check contrast for accessibility (pressing enter or tab after changing the value will update the color selection).

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With automated scanning, an algorithm continuously evaluates code to identify certain accessibility errors. A scan will reveal a “health score” based on its findings, providing a baseline to measure improvement over time.