notes/node_modules/caniuse-db/features-json/css-optional-pseudo.json

{
  "title":":optional CSS pseudo-class",
  "description":"The `:optional` pseudo-class matches form inputs (`<input>`, `<textarea>`, `<select>`) which are not `:required`.",
  "spec":"https://drafts.csswg.org/selectors-4/#optional-pseudo",
  "status":"unoff",
  "links":[
    {
      "url":"https://html.spec.whatwg.org/multipage/scripting.html#selector-optional",
      "title":"HTML specification for `:optional`"
    },
    {
      "url":"https://developer.mozilla.org/en-US/docs/Web/CSS/:optional",
      "title":"Mozilla Developer Network article"
    },
    {
      "url":"http://jsbin.com/fihudu/edit?html,css,output",
      "title":"JS Bin testcase"
    }
  ],
  "bugs":[
    
  ],
  "categories":[
    "CSS"
  ],
  "stats":{
    "ie":{
      "5.5":"n",
      "6":"n",
      "7":"n",
      "8":"n",
      "9":"n",
      "10":"y",
      "11":"y"
    },
    "edge":{
      "12":"y",
      "13":"y",
      "14":"y",
      "15":"y"
    },
    "firefox":{
      "2":"n",
      "3":"n",
      "3.5":"n",
      "3.6":"n",
      "4":"y",
      "5":"y",
      "6":"y",
      "7":"y",
      "8":"y",
      "9":"y",
      "10":"y",
      "11":"y",
      "12":"y",
      "13":"y",
      "14":"y",
      "15":"y",
      "16":"y",
      "17":"y",
      "18":"y",
      "19":"y",
      "20":"y",
      "21":"y",
      "22":"y",
      "23":"y",
      "24":"y",
      "25":"y",
      "26":"y",
      "27":"y",
      "28":"y",
      "29":"y",
      "30":"y",
      "31":"y",
      "32":"y",
      "33":"y",
      "34":"y",
      "35":"y",
      "36":"y",
      "37":"y",
      "38":"y",
      "39":"y",
      "40":"y",
      "41":"y",
      "42":"y",
      "43":"y",
      "44":"y",
      "45":"y",
      "46":"y",
      "47":"y",
      "48":"y",
      "49":"y",
      "50":"y",
      "51":"y",
      "52":"y",
      "53":"y",
      "54":"y"
    },
    "chrome":{
      "4":"u",
      "5":"u",
      "6":"u",
      "7":"u",
      "8":"u",
      "9":"u",
      "10":"u",
      "11":"u",
      "12":"u",
      "13":"u",
      "14":"u",
      "15":"y",
      "16":"y",
      "17":"y",
      "18":"y",
      "19":"y",
      "20":"y",
      "21":"y",
      "22":"y",
      "23":"y",
      "24":"y",
      "25":"y",
      "26":"y",
      "27":"y",
      "28":"y",
      "29":"y",
      "30":"y",
      "31":"y",
      "32":"y",
      "33":"y",
      "34":"y",
      "35":"y",
      "36":"y",
      "37":"y",
      "38":"y",
      "39":"y",
      "40":"y",
      "41":"y",
      "42":"y",
      "43":"y",
      "44":"y",
      "45":"y",
      "46":"y",
      "47":"y",
      "48":"y",
      "49":"y",
      "50":"y",
      "51":"y",
      "52":"y",
      "53":"y",
      "54":"y",
      "55":"y",
      "56":"y",
      "57":"y",
      "58":"y",
      "59":"y"
    },
    "safari":{
      "3.1":"n",
      "3.2":"n",
      "4":"n",
      "5":"y",
      "5.1":"y",
      "6":"y",
      "6.1":"y",
      "7":"y",
      "7.1":"y",
      "8":"y",
      "9":"y",
      "9.1":"y",
      "10":"y",
      "10.1":"y",
      "TP":"y"
    },
    "opera":{
      "9":"u",
      "9.5-9.6":"u",
      "10.0-10.1":"a #1",
      "10.5":"a #1",
      "10.6":"a #1",
      "11":"a #1",
      "11.1":"a #1",
      "11.5":"a #1",
      "11.6":"a #1",
      "12":"a #1",
      "12.1":"a #1",
      "15":"y",
      "16":"y",
      "17":"y",
      "18":"y",
      "19":"y",
      "20":"y",
      "21":"y",
      "22":"y",
      "23":"y",
      "24":"y",
      "25":"y",
      "26":"y",
      "27":"y",
      "28":"y",
      "29":"y",
      "30":"y",
      "31":"y",
      "32":"y",
      "33":"y",
      "34":"y",
      "35":"y",
      "36":"y",
      "37":"y",
      "38":"y",
      "39":"y",
      "40":"y",
      "41":"y",
      "42":"y",
      "43":"y",
      "44":"y",
      "45":"y"
    },
    "ios_saf":{
      "3.2":"n",
      "4.0-4.1":"n",
      "4.2-4.3":"n",
      "5.0-5.1":"y",
      "6.0-6.1":"y",
      "7.0-7.1":"y",
      "8":"y",
      "8.1-8.4":"y",
      "9.0-9.2":"y",
      "9.3":"y",
      "10.0-10.2":"y"
    },
    "op_mini":{
      "all":"a #1"
    },
    "android":{
      "2.1":"u",
      "2.2":"u",
      "2.3":"y",
      "3":"y",
      "4":"y",
      "4.1":"y",
      "4.2-4.3":"y",
      "4.4":"y",
      "4.4.3-4.4.4":"y",
      "53":"y"
    },
    "bb":{
      "7":"y",
      "10":"y"
    },
    "op_mob":{
      "10":"a #1",
      "11":"a #1",
      "11.1":"a #1",
      "11.5":"a #1",
      "12":"a #1",
      "12.1":"a #1",
      "37":"y"
    },
    "and_chr":{
      "56":"y"
    },
    "and_ff":{
      "51":"y"
    },
    "ie_mob":{
      "10":"y",
      "11":"y"
    },
    "and_uc":{
      "11":"y"
    },
    "samsung":{
      "4":"y"
    },
    "and_qq":{
      "1.2":"y"
    }
  },
  "notes":"",
  "notes_by_num":{
    "1":"Does not match non-required `<select>`s"
  },
  "usage_perc_y":93.83,
  "usage_perc_a":3.59,
  "ucprefix":false,
  "parent":"form-validation",
  "keywords":":optional,optional,:required,required",
  "ie_id":"",
  "chrome_id":"",
  "firefox_id":"",
  "webkit_id":"",
  "shown":true
}