Use the HTML <canvas>
element with the canvas scripting API to draw graphics and animations.
Content categories | Flow content, phrasing content, embedded content, palpable content. |
---|---|
Permitted content | Transparent but with no interactive content descendants except for <a> elements, <button> elements, <input> elements whose type attribute is checkbox , radio , or button . |
Tag omission | None, both the starting and ending tag are mandatory. |
Permitted parents | Any element that accepts phrasing_content. |
Permitted ARIA roles | Any |
DOM interface | HTMLCanvasElement |
This element's attributes include the global attributes.
height
moz-opaque
non standardwidth
You may (and should) provide alternate content inside the <canvas>
block. That content will be rendered both on older browsers that don't support canvas and in browsers with JavaScript disabled.
</canvas>
tagUnlike the <img>
element, the <canvas>
element requires the closing tag (</canvas>
).
The displayed size of the canvas can be changed using a stylesheet. The image is scaled during rendering to fit the styled size. If your renderings seem distorted, try specifying your width
and height
attributes explicitly in the <canvas>
attributes, and not using CSS.
This code snippet adds a canvas element to your HTML document. A fallback text is provided if a browser is unable to render the canvas, or if can't read a canvas. Providing a useful fallback text or sub DOM helps to make the the canvas more accessible.
<canvas id="canvas" width="300" height="300"> An alternative text describing what your canvas displays. </canvas>
If your canvas does not use transparency set the moz-opaque
attribute on the canvas tag. This information can be used internally to optimize rendering. However, this attribute has not been standardized and only works in Mozilla-based rendering engines.
<canvas id="mycanvas" moz-opaque></canvas>
Specification | Status | Comment |
---|---|---|
WHATWG HTML Living Standard The definition of '<canvas>' in that specification. | Living Standard | |
HTML5 The definition of '<canvas>' in that specification. | Recommendation | Initial definition |
Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 1.0 | (Yes) |
1.5 (1.8)[1] 6.0 (6.0)[2] 12.0 (12.0)[3] | 9.0 | 9.0[4] | 2.0[5] |
moz-opaque | No support | No support | 3.5 (1.9.1) | No support | No support | No support |
Feature | Firefox Mobile (Gecko) | Android | Edge | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support |
1.5 (1.8)[1] 6.0 (6.0)[2] 12.0 (12.0)[3] | ? | (Yes) | ? | ? | 1.0 |
moz-opaque | 1.0 (1.9.1) | No support | No support | No support | No support | No support |
[1] Before Gecko 5.0 (Firefox 5.0 / Thunderbird 5.0 / SeaMonkey 2.2), the canvas width and height were signed integers instead of unsigned integers.
[2] Prior to Gecko 6.0 (Firefox 6.0 / Thunderbird 6.0 / SeaMonkey 2.3), a <canvas>
element with a zero width or height would be rendered as if it had default dimensions.
[3] Before Gecko 12.0 (Firefox 12.0 / Thunderbird 12.0 / SeaMonkey 2.9), if JavaScript is disabled, the <canvas>
element was being rendered instead of showing the fallback content as per the specification. Now the fallback content is rendered instead.
[4] See the changelog for Opera 9.0.
[5] Although early versions of Apple's Safari browser don't require the closing tag, the specification indicates that it is required, so you should be sure to include it for broadest compatibility. Those versions of Safari (prior to version 2.0) will render the content of the fallback in addition to the canvas itself unless you use CSS tricks to mask it. Fortunately, users of these versions of Safari are rare nowadays.
© 2005–2017 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/canvas