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Yes: a logo can have a 1.00:1 contrast ratio and still meet WCAG’s contrast criteria because text that is part of a logo or brand name is exempt from the text-contrast minimum. But that exception does not make every use of a low-contrast logo accessible, and a 1.00:1 result alone cannot establish that an entire page passed an audit.
What a 1.00:1 contrast ratio means
W3C defines contrast ratio by comparing the relative luminance of the lighter color with that of the darker color. The scale runs from 1:1 to 21:1; 1:1 is its lowest value, where the two colors have equal luminance. A reported ratio does not identify the colors or explain how the measurement was made, so the figure in the title cannot be independently reproduced from the ratio alone.
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More importantly, a contrast checker evaluates a color pair. Whether a page meets WCAG depends on what the visual content does, what other checks apply, and whether an exception covers it.
Why a logo can be exempt from text contrast
WCAG 2.2 Success Criterion 1.4.3 generally requires a contrast ratio of at least 4.5:1 for text, with specified exceptions. One is text that is part of a logo or brand name: WCAG says it has “no contrast requirement.” The exception recognizes that a brand mark may have fixed colors that are not chosen to meet ordinary text-contrast thresholds. See W3C, Web Content Accessibility Guidelines (WCAG) 2.2, Success Criterion 1.4.3.
W3C also explains that logos are exempt from non-text contrast requirements on the assumption that their colors must follow stricter corporate identity or brand guidelines. That exception is not a blanket pass for any graphic: W3C cautions that a logo normally designed with higher contrast does not become essential merely because it is deliberately shown at low contrast for reasons unrelated to brand identity. See W3C WAI, Understanding Success Criterion 1.4.11: Non-text Contrast.
When the logo is also a link or control
Separate the logo’s role as a brand mark from the role of the control containing it. If the logo is the only visible content of a link or other control, users still need to identify and operate that control. Check whether its purpose is communicated accessibly, whether the control has a visible focus indication, and whether any other visual information needed to identify it is sufficiently distinguishable.
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When brand rules permit, a higher-contrast logo variant may help. Another option is to provide an equivalent control that has sufficient contrast and a clear purpose. These measures address the usability of the control; the logo exception does not by itself establish that the surrounding interaction is accessible.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteHow to assess a low-contrast logo in an audit
- Identify the mark’s role. Determine whether it is only identifying a brand, or whether it also serves as a link or another control.
- Check the applicable contrast criterion. For logo text, consider the logotype exception under SC 1.4.3. For meaningful non-text graphics and visual information needed to identify applicable UI components, assess SC 1.4.11, which generally requires at least 3:1 contrast subject to its exceptions.
- Inspect the control’s other cues and states. Verify that users can understand the control’s purpose and perceive required indicators, including focus, rather than judging only the logo’s color pair.
- Use the actual colors and context. Record the logo and background colors, the measurement method, and the relevant interface state. If a graphic contains areas with different contrast, examine the least-contrasting area that carries meaning.
- Document the scope of the result. State which content, states, and criteria were checked and why any exception applies. A single ratio cannot stand in for a complete accessibility audit.
What “passed every check” can and cannot tell you
The statement that a logo at 1.00:1 “passed every check we had” is not independently verifiable without the logo, its background, the audit checklist, and the test report. It may describe a properly scoped review that applied the logo exception; it does not show that every applicable WCAG requirement on the page was satisfied. To evaluate the claim, establish what was tested, whether the mark was interactive, and which criteria and interface states the checks covered.
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