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HTML gives us the
picture tag, which does a very similar job of the
srcset attribute of an
img tag, and the differences are very subtle.
picture when instead of just serving a smaller version of a file, you completely want to change it. Or serve a different image format.
The best use case I found is when serving a WebP image, which is a format still not widely supported. In the
picture tag you specify a list of images, and they will be used in order, so in the next example, browsers that support WebP will use the first image, and fallback to JPG if not:
<picture> <source type="image/webp" srcset="image.webp"> <img src="image.jpg" alt="An image"> </picture>
sourcetag defines one (or more) formats for the images. The
imgtag is the fallback in case the browser is very old and does not support the
source tag inside
picture you can add a
media attribute to set media queries.
The example that follows kind of works like the above example with
<picture> <source media="(min-width: 500w)" srcset="dog-500.png" sizes="100vw"> <source media="(min-width: 800w)" srcset="dog-800.png" sizes="100vw"> <source media="(min-width: 1000w)" srcset="dog-1000.png" sizes="800px"> <source media="(min-width: 1400w)" srcset="dog-1400.png" sizes="800px"> <img src="dog.png" alt="A dog image"> </picture>
But that’s not its use case, because as you can see it’s much more verbose.
picture tag is recent but is now supported by all the major browsers except Opera Mini and IE (all versions).