Invalid test for list-style-type CSS property values

[jugglinmike]

The "harness" test for CSS property values uses the CSS.supports function where available. This is not a reliable way to test support for list-style-type values because that CSS property accepts any arbitrary string value.

This is apparent in the data for Chrome stored in the mdn-bcd-results repository: the results for the value "afar" are true for versions 1 through 44, false for versions 45 through 90, and then true again for versions 91 through 105.

click to reveal an awful shell script which highlights the relevant results

$ for f in *chrome*mac-os*; do v=$(echo $f | sed 's/^.*chrome-\([^-]\+\)-.*$/\1/g'); r=$(python -m json.tool < $f | grep -A1 '\.afar' | tail -n1); echo $v $r; done | sort -n
16.0.912.75 "result": true
17.0.963.26 "result": true
18.0.1025.151 "result": true
19.0.1084.56 "result": true
20.0.1132.47 "result": true
21.0.1180.57 "result": true
22.0.1229.92 "result": true
23.0.1271.101 "result": true
24.0.1312.52 "result": true
25.0.1364.172 "result": true
26.0.1410.65 "result": true
27.0.1453.116 "result": true
29.0.1547.62 "result": true
30.0.1599.101 "result": true
31.0.1650.57 "result": true
32.0.1700.102 "result": true
33.0.1750.117 "result": true
35.0.1916.114 "result": true
37.0.2062.94 "result": true
38.0.2125.101 "result": true
40.0.2214.93 "result": true
41.0.2272.76 "result": true
42.0.2311.135 "result": true
43.0.2357.65 "result": true
44.0.2403.89 "result": true
45.0.2454.85 "result": false
46.0.2490.71 "result": false
47.0.2526.73 "result": false
48.0.2564.97 "result": false
49.0.2623.75 "result": false
50.0.2661.75 "result": false
51.0.2704.79 "result": false
52.0.2743.82 "result": false
53.0.2785.89 "result": false
54.0.2840.59 "result": false
55.0.2883.75 "result": false
56.0.2924.76 "result": false
57.0.2987.98 "result": false
58.0.3029.81 "result": false
59.0.3071.86 "result": false
60.0.3112.78 "result": false
61.0.3163.79 "result": false
62.0.3202.62 "result": false
63.0.3239.84 "result": false
65.0.3325.146 "result": false
66.0.3359.117 "result": false
67.0.3396.62 "result": false
68.0.3440.75 "result": false
69.0.3497.81 "result": false
70.0.3538.67 "result": false
71.0.3578.80 "result": false
72.0.3626.81 "result": false
73.0.3683.75 "result": false
74.0.3729.131 "result": false
75.0.3770.80 "result": false
76.0.3809.87 "result": false
77.0.3865.75 "result": false
78.0.3904.70 "result": false
79.0.3945.79 "result": false
80.0.3987.132 "result": false
81.0.4044.129 "result": false
83.0.4103.61 "result": false
84.0.4147.89 "result": false
85.0.4183.83 "result": false
86.0.4240.183 "result": false
87.0.4280.66 "result": false
88.0.4324.150 "result": false
89.0.4389.90 "result": false
90.0.4430.72 "result": false
91.0.4472.106 "result": true
92.0.4515.107 "result": true
93.0.4577.63 "result": true
94.0.4606.71 "result": true
95.0.4638.54 "result": true
96.0.4664.110 "result": true
97.0.4692.71 "result": true
98.0.4758.80 "result": true
99.0.4844.51 "result": true
100.0.4896.127 "result": true
101.0.4951.41 "result": true
102.0.5005.61 "result": true
103.0.5060.114 "result": true
104.0.5112.79 "result": true
105.0.0.0 "result": true

The update-bcd script does not reflect this history in BCD due to a known deficiency.

[foolip]

Hmm, I wonder if this affects other properties as well? I suppose we could test a known unsupported value for all properties and look into the ones that are "supported".

[foolip]

Reposted at openwebdocs/mdn-bcd-collector#723.