It does not include shadow and glow effects outside the component's content, background, or border. Note 2: Examples of sub-components that may receive a focus indicator are menu items in an opened drop-down menu, or focusable cells in a grid. Note 3: Contrast calculations can be based on colors defined within the technology (such as HTML, CSS and SVG). Pixels modified by user agent resolution enhancements and anti-aliasing can be ignored. Understanding 2.4.13 Show Hide techniques and failures for 2.4.13 Sufficient Advisory Failures Sufficient Techniques for Success Criterion 2.4.13 Note: Other techniques may also be sufficient if they meet the success criterion.