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+{
+ "title":"calc() as CSS unit value",
+ "description":"Method of allowing calculated values for length units, i.e. `width: calc(100% - 3em)`",
+ "spec":"https://www.w3.org/TR/css3-values/#calc",
+ "status":"cr",
+ "links":[
+ {
+ "url":"https://hacks.mozilla.org/2010/06/css3-calc/",
+ "title":"Mozilla Hacks article"
+ },
+ {
+ "url":"https://developer.mozilla.org/en/docs/Web/CSS/calc",
+ "title":"MDN Web Docs - calc"
+ },
+ {
+ "url":"https://www.webplatform.org/docs/css/functions/calc",
+ "title":"WebPlatform Docs"
+ }
+ ],
+ "bugs":[
+ {
+ "description":"IE 9 - 11 and Edge do not support `width: calc()` on table cells. [Bug Report](https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/10982196/)"
+ },
+ {
+ "description":"IE 9 - 11 don't render `box-shadow` when `calc()` is used for any of the values"
+ },
+ {
+ "description":"IE10 crashes when a div with a property using `calc()` has a child with [same property with inherit](https://stackoverflow.com/questions/19423384/css-less-calc-method-is-crashing-my-ie10)."
+ },
+ {
+ "description":"IE10, IE11, and Edge < 14 don't support using `calc()` inside a `transform`. [Bug report](https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/104773/)"
+ },
+ {
+ "description":"IE11 is reported to have trouble with `calc()` with nested expressions, e.g. `width: calc((100% - 10px) / 3);` (i.e. it rounds differently)"
+ },
+ {
+ "description":"IE11 is reported to not support `calc()` correctly in [generated content](https://stackoverflow.com/questions/31323915/internet-explorer-incorrectly-calculates-percentage-height-for-generated-content)"
+ },
+ {
+ "description":"IE11 does not support transitioning values set with `calc()`"
+ },
+ {
+ "description":"Safari & iOS Safari (both 6 and 7) does not support viewport units (`vw`, `vh`, etc) in `calc()`."
+ },
+ {
+ "description":"IE & Edge are reported to not support calc inside a 'flex'. (Not tested on older versions)\r\nThis example does not work: `flex: 1 1 calc(50% - 20px);`"
+ },
+ {
+ "description":"Firefox <48 does not support `calc()` inside the `line-height`, `stroke-width`, `stroke-dashoffset`, and `stroke-dasharray` properties. [Bug report](https://bugzilla.mozilla.org/show_bug.cgi?id=594933)"
+ },
+ {
+ "description":"Firefox does not support `width: calc()` on table cells. [Bug Report](https://bugzilla.mozilla.org/show_bug.cgi?id=1297576)"
+ },
+ {
+ "description":"Firefox does not support `calc()` on color functions. Example: `color: hsl(calc(60 * 2), 100%, 50%)`. [Bug Report](https://bugzilla.mozilla.org/show_bug.cgi?id=984021)"
+ }
+ ],
+ "categories":[
+ "CSS3"
+ ],
+ "stats":{
+ "ie":{
+ "5.5":"n",
+ "6":"n",
+ "7":"n",
+ "8":"n",
+ "9":"a #2",
+ "10":"y",
+ "11":"y"
+ },
+ "edge":{
+ "12":"y",
+ "13":"y",
+ "14":"y",
+ "15":"y",
+ "16":"y",
+ "17":"y",
+ "18":"y"
+ },
+ "firefox":{
+ "2":"n",
+ "3":"n",
+ "3.5":"n",
+ "3.6":"n",
+ "4":"y x",
+ "5":"y x",
+ "6":"y x",
+ "7":"y x",
+ "8":"y x",
+ "9":"y x",
+ "10":"y x",
+ "11":"y x",
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+ "16":"y",
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+ "62":"y",
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+ "65":"y"
+ },
+ "chrome":{
+ "4":"n",
+ "5":"n",
+ "6":"n",
+ "7":"n",
+ "8":"n",
+ "9":"n",
+ "10":"n",
+ "11":"n",
+ "12":"n",
+ "13":"n",
+ "14":"n",
+ "15":"n",
+ "16":"n",
+ "17":"n",
+ "18":"n",
+ "19":"y x",
+ "20":"y x",
+ "21":"y x",
+ "22":"y x",
+ "23":"y x",
+ "24":"y x",
+ "25":"y x",
+ "26":"y",
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+ },
+ "safari":{
+ "3.1":"n",
+ "3.2":"n",
+ "4":"n",
+ "5":"n",
+ "5.1":"n",
+ "6":"y x",
+ "6.1":"y",
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+ "TP":"y"
+ },
+ "opera":{
+ "9":"n",
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+ "10.0-10.1":"n",
+ "10.5":"n",
+ "10.6":"n",
+ "11":"n",
+ "11.1":"n",
+ "11.5":"n",
+ "11.6":"n",
+ "12":"n",
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+ "56":"y"
+ },
+ "ios_saf":{
+ "3.2":"n",
+ "4.0-4.1":"n",
+ "4.2-4.3":"n",
+ "5.0-5.1":"n",
+ "6.0-6.1":"y x",
+ "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",
+ "11.3-11.4":"y",
+ "12":"y"
+ },
+ "op_mini":{
+ "all":"n"
+ },
+ "android":{
+ "2.1":"n",
+ "2.2":"n",
+ "2.3":"n",
+ "3":"n",
+ "4":"n",
+ "4.1":"n",
+ "4.2-4.3":"n",
+ "4.4":"a #1",
+ "4.4.3-4.4.4":"a #1",
+ "67":"y"
+ },
+ "bb":{
+ "7":"n",
+ "10":"y"
+ },
+ "op_mob":{
+ "10":"n",
+ "11":"n",
+ "11.1":"n",
+ "11.5":"n",
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+ "46":"y"
+ },
+ "and_chr":{
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+ },
+ "and_ff":{
+ "62":"y"
+ },
+ "ie_mob":{
+ "10":"y",
+ "11":"y"
+ },
+ "and_uc":{
+ "11.8":"y"
+ },
+ "samsung":{
+ "4":"y",
+ "5":"y",
+ "6.2":"y",
+ "7.2":"y"
+ },
+ "and_qq":{
+ "1.2":"y"
+ },
+ "baidu":{
+ "7.12":"y"
+ }
+ },
+ "notes":"Support can be somewhat emulated in older versions of IE using the non-standard `expression()` syntax.\r\n\r\nDue to the way browsers handle [sub-pixel rounding](http://ejohn.org/blog/sub-pixel-problems-in-css/) differently, layouts using `calc()` expressions may have unexpected results.",
+ "notes_by_num":{
+ "1":"Partial support in Android Browser 4.4 refers to the browser lacking the ability to multiply and divide values.",
+ "2":"Partial support in IE9 refers to the browser crashing when used as a `background-position` value."
+ },
+ "usage_perc_y":92.57,
+ "usage_perc_a":0.58,
+ "ucprefix":false,
+ "parent":"",
+ "keywords":"",
+ "ie_id":"csscalc",
+ "chrome_id":"5765241438732288",
+ "firefox_id":"",
+ "webkit_id":"",
+ "shown":true
+}
generated by cgit v1.2.3 (git 2.25.1) at 2026-07-23 22:05:21 +0000