AMR/node_modules/caniuse-db/features-json/script-defer.json

{
  "title":"defer attribute for external scripts",
  "description":"The boolean defer attribute on script elements allows the external JavaScript file to run when the DOM is loaded, without delaying page load first.",
  "spec":"https://html.spec.whatwg.org/multipage/scripting.html#attr-script-defer",
  "status":"ls",
  "links":[
    {
      "url":"https://developer.mozilla.org/en/HTML/Element/script#Attributes",
      "title":"MDN Web Docs - Script Attributes"
    },
    {
      "url":"https://raw.github.com/phiggins42/has.js/master/detect/script.js#script-defer",
      "title":"has.js test"
    },
    {
      "url":"https://www.webplatform.org/docs/html/attributes/defer",
      "title":"WebPlatform Docs"
    },
    {
      "url":"http://www.growingwiththeweb.com/2014/02/async-vs-defer-attributes.html",
      "title":"async vs defer attributes"
    }
  ],
  "bugs":[
    {
      "description":"IE < 10 may interleave execution of scripts, [See the discussion](https://github.com/h5bp/lazyweb-requests/issues/42)."
    },
    {
      "description":"Google Chrome does not defer scripts with the `defer` attribute when the page is served as XHTML (`application/xhtml+xml`) - [Chromium Issue #611136](https://bugs.chromium.org/p/chromium/issues/detail?id=611136), [Chromium Issue #874749](https://bugs.chromium.org/p/chromium/issues/detail?id=874749)"
    }
  ],
  "categories":[
    "DOM",
    "HTML5"
  ],
  "stats":{
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      "5.5":"a #1",
      "6":"a #1",
      "7":"a #1",
      "8":"a #1",
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      "11":"y"
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      "96":"y",
      "97":"y",
      "98":"y",
      "99":"y"
    },
    "firefox":{
      "2":"n",
      "3":"n",
      "3.5":"y #2",
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      "4":"y #2",
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      "100":"y"
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      "4":"n",
      "5":"n",
      "6":"n",
      "7":"n",
      "8":"y",
      "9":"y",
      "10":"y",
      "11":"y",
      "12":"y",
      "13":"y",
      "14":"y",
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      "98":"y",
      "99":"y",
      "100":"y",
      "101":"y",
      "102":"y",
      "103":"y"
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    "safari":{
      "3.1":"n",
      "3.2":"n",
      "4":"n",
      "5":"y",
      "5.1":"y",
      "6":"y",
      "6.1":"y",
      "7":"y",
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      "8":"y",
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      "15":"y",
      "15.1":"y",
      "15.2-15.3":"y",
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    },
    "opera":{
      "9":"n",
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      "10.0-10.1":"n",
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      "11":"n",
      "11.1":"n",
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      "15":"y",
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    },
    "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",
      "10.3":"y",
      "11.0-11.2":"y",
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      "12.0-12.1":"y",
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      "13.4-13.7":"y",
      "14.0-14.4":"y",
      "14.5-14.8":"y",
      "15.0-15.1":"y",
      "15.2-15.3":"y",
      "15.4":"y"
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    "op_mini":{
      "all":"n"
    },
    "android":{
      "2.1":"n",
      "2.2":"n",
      "2.3":"n",
      "3":"y",
      "4":"y",
      "4.1":"y",
      "4.2-4.3":"y",
      "4.4":"y",
      "4.4.3-4.4.4":"y",
      "99":"y"
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    "bb":{
      "7":"y",
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    "op_mob":{
      "10":"n",
      "11":"n",
      "11.1":"n",
      "11.5":"n",
      "12":"n",
      "12.1":"n",
      "64":"y"
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    "and_chr":{
      "100":"y"
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    "and_ff":{
      "98":"y"
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    "ie_mob":{
      "10":"y",
      "11":"y"
    },
    "and_uc":{
      "12.12":"y"
    },
    "samsung":{
      "4":"y",
      "5.0-5.4":"y",
      "6.2-6.4":"y",
      "7.2-7.4":"y",
      "8.2":"y",
      "9.2":"y",
      "10.1":"y",
      "11.1-11.2":"y",
      "12.0":"y",
      "13.0":"y",
      "14.0":"y",
      "15.0":"y",
      "16.0":"y"
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    "and_qq":{
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    "baidu":{
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    "kaios":{
      "2.5":"y"
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  },
  "notes":"",
  "notes_by_num":{
    "1":"Partial support in older IE refers to a buggy implementation (see issue).",
    "2":"Deferred scripts may run after DOMContentLoaded - https://bugzilla.mozilla.org/show_bug.cgi?id=688580"
  },
  "usage_perc_y":96.69,
  "usage_perc_a":0.13,
  "ucprefix":false,
  "parent":"",
  "keywords":"",
  "ie_id":"",
  "chrome_id":"",
  "firefox_id":"",
  "webkit_id":"",
  "shown":true
}