The browser will consider each child
<source> element and choose the best match among them. If no matches are found—or the browser doesn't support the
<picture> element—the URL of the
src attribute is selected. The selected image is then presented in the space occupied by the
To decide which URL to load, the user agent examines each
type attributes to select a compatible image that best matches the current layout and capabilities of the display device.
<img> element serves two purposes:
- It describes the size and other attributes of the image and its presentation.
- It provides a fallback in case none of the offered
<source>elements are able to provide a usable image.
Common use cases for
- Art direction. Cropping or modifying images for different
mediaconditions (for example, loading a simpler version of an image which has too many details, on smaller displays).
- Offering alternative image formats, for cases where certain formats are not supported.
- Saving bandwidth and speeding page load times by loading the most appropriate image for the viewer's display.
If providing higher-density versions of an image for high-DPI (Retina) display, use
srcset on the
<img> element instead. This lets browsers opt for lower-density versions in data-saving modes, and you don't have to write explicit
|Content categories||Flow content, phrasing content, embedded content|
Zero or more
|Tag omission||None, both the starting and ending tag are mandatory.|
|Permitted parents||Any element that allows embedded content.|
|Implicit ARIA role||No corresponding role|
|Permitted ARIA roles||No
This element includes only global attributes.
These examples demonstrate how different attributes of the
<source> element change the selection of the image inside
media attribute specifies a media condition (similar to a media query) that the user agent will evaluate for each
<source>'s media condition evaluates to
false, the browser skips it and evaluates the next element inside
<picture> <source srcset="mdn-logo-wide.png" media="(min-width: 600px)" /> <img src="mdn-logo-narrow.png" alt="MDN" /> </picture>
The srcset attribute is used to offer a list of possible images based on size or the display's pixel density.
It is composed of a comma-separated list of image descriptors. Each image descriptor is composed of a URL of the image, and either:
a width descriptor, followed by a
- a pixel density descriptor, followed by an
2x) to serve a high-res image for high-DPI screens.
Make sure to note that:
- width and pixel density descriptors should not be used together
- a missing pixel density descriptor implies 1x
- duplicate descriptor values are not allowed (2x & 2x, 100w & 100w)
The following example illustrates the usage of
srcset attribute with the
<source> element to specify a high-density and standard-resolution image:
<picture> <source srcset="logo.png, logo-1.5x.png 1.5x" /> <img src="logo.png" alt="MDN Web Docs logo" height="320" width="320" /> </picture>
srcset attribute can also be used on the
<img> element without needing the
<picture> element. The following example demonstrates how to use the
srcset attribute to specify standard-resolution and high-density images, respectively:
<img srcset="logo.png, logo-2x.png 2x" src="logo.png" height="320" width="320" alt="MDN Web Docs logo" />
sizes attribute is not mandatory when using srcset, but it is recommended to use it in order to provide additional information to the browser to help it select the best image source.
Without sizes, the browser will use the default size of the image as specified by its dimensions in pixels. This may not be the best fit for all devices, especially if the image is displayed on different screen sizes or in different contexts.
Please note that sizes will have its effect only if width dimension descriptors are provided with srcset instead of pixel ratio values (200w instead of 2x for example).
For more information on using
srcset, see the Responsive images documentation.
<picture> <source srcset="photo.avif" type="image/avif" /> <source srcset="photo.webp" type="image/webp" /> <img src="photo.jpg" alt="photo" /> </picture>
|HTML Standard |
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