{
  "title":"Form validation",
  "description":"Method of setting required fields and field types without requiring JavaScript. This includes preventing forms from being submitted when appropriate, the `checkValidity()` method as well as support for the `:invalid`, `:valid`, and `:required` CSS pseudo-classes.",
  "spec":"https://html.spec.whatwg.org/multipage/forms.html#client-side-form-validation",
  "status":"ls",
  "links":[
    {
      "url":"http://docs.webplatform.org/wiki/html/attributes/required",
      "title":"WebPlatform Docs"
    },
    {
      "url":"https://webkit.org/blog/7099/html-interactive-form-validation/",
      "title":"WebKit Blog: HTML Interactive Form Validation"
    }
  ],
  "bugs":[
    {
      "description":"IE10 and 11 [have a problem](http://stackoverflow.com/questions/20241415/html5-number-input-field-step-attribute-broken-in-internet-explorer-10-and-inter) validating number fields in combination with the `step` attribute and certain values"
    },
    {
      "description":"In Chrome (tested in 45) inputs marked as disabled or hidden while also marked as required are [incorrectly](https://html.spec.whatwg.org/multipage/forms.html#concept-fe-disabled) being considered for constraint validation. https://html.spec.whatwg.org/multipage/forms.html#concept-fe-disabled"
    },
    {
      "description":"[IE & Edge do not support `:valid` on `form` elements.](https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/8114184/) Firefox<51 seemed to only match `:valid` on `form`s after child element values have changed from an invalid to valid state; see [bug #1285425](https://bugzilla.mozilla.org/show_bug.cgi?id=1285425)."
    }
  ],
  "categories":[
    "HTML5"
  ],
  "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":"n",
      "5":"n",
      "6":"n",
      "7":"n",
      "8":"n",
      "9":"n",
      "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",
      "55":"y",
      "56":"y",
      "57":"y",
      "58":"y",
      "59":"y"
    },
    "safari":{
      "3.1":"n",
      "3.2":"n",
      "4":"n",
      "5":"a #1",
      "5.1":"a #1",
      "6":"a #1",
      "6.1":"a #1",
      "7":"a #1",
      "7.1":"a #1",
      "8":"a #1",
      "9":"a #1",
      "9.1":"a #1",
      "10":"a #1",
      "10.1":"y",
      "TP":"y"
    },
    "opera":{
      "9":"n",
      "9.5-9.6":"n",
      "10.0-10.1":"y",
      "10.5":"y",
      "10.6":"y",
      "11":"y",
      "11.1":"y",
      "11.5":"y",
      "11.6":"y",
      "12":"y",
      "12.1":"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"
    },
    "ios_saf":{
      "3.2":"n",
      "4.0-4.1":"a #1",
      "4.2-4.3":"a #1",
      "5.0-5.1":"a #1",
      "6.0-6.1":"a #1",
      "7.0-7.1":"a #1",
      "8":"a #1",
      "8.1-8.4":"a #1",
      "9.0-9.2":"a #1",
      "9.3":"a #1",
      "10.0-10.2":"a #1"
    },
    "op_mini":{
      "all":"a #3"
    },
    "android":{
      "2.1":"n",
      "2.2":"n",
      "2.3":"n",
      "3":"n",
      "4":"a #1",
      "4.1":"a #1",
      "4.2-4.3":"a #1",
      "4.4":"a #1",
      "4.4.3-4.4.4":"y",
      "53":"y"
    },
    "bb":{
      "7":"a #1",
      "10":"y"
    },
    "op_mob":{
      "10":"y",
      "11":"y",
      "11.1":"y",
      "11.5":"y",
      "12":"y",
      "12.1":"y",
      "37":"y"
    },
    "and_chr":{
      "56":"y"
    },
    "and_ff":{
      "51":"y"
    },
    "ie_mob":{
      "10":"a #2",
      "11":"a #2"
    },
    "and_uc":{
      "11":"y"
    },
    "samsung":{
      "4":"y"
    },
    "and_qq":{
      "1.2":"y"
    }
  },
  "notes":"",
  "notes_by_num":{
    "1":"Partial support refers to lack of notice when form with required fields is attempted to be submitted. See [WebKit bug](https://bugs.webkit.org/show_bug.cgi?id=28649).",
    "2":"Partial support in IE10 mobile refers to lack of warning when blocking submission.",
    "3":"Partial support in Opera Mini refers to only supporting the CSS pseudo classes."
  },
  "usage_perc_y":79.33,
  "usage_perc_a":18.13,
  "ucprefix":false,
  "parent":"forms",
  "keywords":"",
  "ie_id":"",
  "chrome_id":"6091813840486400",
  "firefox_id":"",
  "webkit_id":"feature-html-interactive-form-validation",
  "shown":true
}