HTTP/2 301
server: nginx
date: Wed, 23 Jul 2025 23:26:12 GMT
content-type: text/html
content-length: 162
location: https://developer.mozilla.org/en-US/docs/Web/API/HTMLSourceElement
strict-transport-security: max-age=60; includeSubDomains
via: 1.1 google
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
HTTP/2 200
content-type: text/html
x-guploader-uploadid: ABgVH88HfLFI2f8b-jAwZbxD9Nz-4qcxE9u-_7P03AAIEB6A5JNI0t4BCNjoZhOexFlEyb-V
cache-control: public, max-age=3600
expires: Thu, 24 Jul 2025 00:26:13 GMT
last-modified: Wed, 23 Jul 2025 00:45:37 GMT
etag: W/"78cc497da4ace2c504e047a391d825b4"
x-goog-generation: 1753231537200057
x-goog-metageneration: 1
x-goog-stored-content-encoding: identity
x-goog-stored-content-length: 77259
x-goog-meta-goog-reserved-file-mtime: 1753230314
x-goog-hash: crc32c=qUyMrw==, md5=eMxJfaSs4sUE4EejkdgltA==
x-goog-storage-class: STANDARD
accept-ranges: none
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
alt-svc: clear
x-content-type-options: nosniff
strict-transport-security: max-age=63072000
content-security-policy: default-src 'self'; script-src 'report-sample' 'self' 'wasm-unsafe-eval' https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js assets.codepen.io production-assets.codepen.io https://js.stripe.com 'sha256-EehWlTYp7Bqy57gDeQttaWKp0ukTTEUKGP44h8GVeik=' 'sha256-XNBp89FG76amD8BqrJzyflxOF9PaWPqPqvJfKZPCv7M='; script-src-elem 'report-sample' 'self' 'wasm-unsafe-eval' https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js assets.codepen.io production-assets.codepen.io https://js.stripe.com 'sha256-EehWlTYp7Bqy57gDeQttaWKp0ukTTEUKGP44h8GVeik=' 'sha256-XNBp89FG76amD8BqrJzyflxOF9PaWPqPqvJfKZPCv7M='; style-src 'report-sample' 'self' 'unsafe-inline'; object-src 'none'; base-uri 'self'; connect-src 'self' developer.allizom.org bcd.developer.allizom.org bcd.developer.mozilla.org updates.developer.allizom.org updates.developer.mozilla.org https://*.google-analytics.com https://*.analytics.google.com https://*.googletagmanager.com https://incoming.telemetry.mozilla.org https://observatory-api.mdn.allizom.net https://observatory-api.mdn.mozilla.net https://api.github.com/search/issues stats.g.doubleclick.net https://api.stripe.com; font-src 'self'; frame-src 'self' interactive-examples.mdn.mozilla.net interactive-examples.mdn.allizom.net mdn.github.io live-samples.mdn.mozilla.net live-samples.mdn.allizom.net *.mdnplay.dev *.mdnyalp.dev *.play.test.mdn.allizom.net https://v2.scrimba.com https://scrimba.com jsfiddle.net www.youtube-nocookie.com codepen.io survey.alchemer.com https://js.stripe.com; img-src 'self' data: *.githubusercontent.com *.googleusercontent.com *.gravatar.com mozillausercontent.com firefoxusercontent.com profile.stage.mozaws.net profile.accounts.firefox.com developer.mozilla.org mdn.dev interactive-examples.mdn.mozilla.net interactive-examples.mdn.allizom.net wikipedia.org upload.wikimedia.org https://mdn.github.io/shared-assets/ https://mdn.dev/ https://*.google-analytics.com https://*.googletagmanager.com www.gstatic.com; manifest-src 'self'; media-src 'self' archive.org videos.cdn.mozilla.net https://mdn.github.io/shared-assets/; child-src 'self'; worker-src 'self';
x-frame-options: DENY
origin-trial: AxVILwizhbMjxFeHOn1P3R8niO1RJY/smaK4B4d1rLzc1gTaxtXMSaTi+FoigYgCw40uFRDwFcEAeqDR+vVLOW4AAABfeyJvcmlnaW4iOiJodHRwczovL2RldmVsb3Blci5tb3ppbGxhLm9yZyIsImZlYXR1cmUiOiJQcml2YXRlQXR0cmlidXRpb25WMiIsImV4cGlyeSI6MTc0MjA3OTYwMH0=
x-cloud-trace-context: 6ed5aa95a5a5ca0d5e65ae4bdf8c75ab
date: Wed, 23 Jul 2025 23:26:13 GMT
server: Google Frontend
via: 1.1 google
vary: Accept-Encoding
content-encoding: gzip
x-cache: miss
HTMLSourceElement - Web APIs | MDN
The HTMLSourceElement
interface provides special properties (beyond the regular HTMLElement
object interface it also has available to it by inheritance) for manipulating <source>
elements.
EventTarget
Node
Element
HTMLElement
HTMLSourceElement
Inherits properties from its parent, HTMLElement
.
HTMLSourceElement.height
A number that reflects the height
HTML attribute, indicating the height of the image resource in CSS pixels. The property has a meaning only if the parent of the current <source>
element is a <picture>
element.
HTMLSourceElement.media
A string reflecting the media
HTML attribute, containing the intended type of the media resource.
HTMLSourceElement.sizes
A string representing image sizes between breakpoints
HTMLSourceElement.src
A string reflecting the src
HTML attribute, containing the URL for the media resource. The HTMLSourceElement.src
property has a meaning only when the associated <source>
element is nested in a media element that is a <video>
or an <audio>
element. It has no meaning and is ignored when it is nested in a <picture>
element.
Note:
If the src
property is updated (along with any siblings), the parent HTMLMediaElement
's load
method should be called when done, since <source>
elements are not re-scanned automatically.
HTMLSourceElement.srcset
A string reflecting the srcset
HTML attribute, containing a list of candidate images, separated by a comma (',', U+002C COMMA
). A candidate image is a URL followed by a 'w'
with the width of the images, or an 'x'
followed by the pixel density.
HTMLSourceElement.type
A string reflecting the type
HTML attribute, containing the type of the media resource.
HTMLSourceElement.width
A number that reflects the width
HTML attribute, indicating the width of the image resource in CSS pixels. The property has a meaning only if the parent of the current <source>
element is a <picture>
element.
No specific method; inherits methods from its parent, HTMLElement
.