You can now specify whether to display images for light or dark themes in Markdown, using the HTML <picture> element in combination with the prefers-color-scheme media feature.
For example:
<picture>
<source media="(prefers-color-scheme: dark)" srcset="https://user-images.githubusercontent.com/25423296/163456776-7f95b81a-f1ed-45f7-b7ab-8fa810d529fa.png">
<img alt="Shows an illustrated sun in light color mode and a moon with stars in dark color mode." src="https://user-images.githubusercontent.com/25423296/163456779-a8556205-d0a5-45e2-ac17-42d089e3c3f8.png">
</picture>
There is now an option to prevent animated images, like GIFs, from playing automatically. By default, GitHub respects your system level preference to reduce motion. However, you can also disable autoplay entirely in the Accessibility settings. Once disabled, two buttons will let you control animated images: a play/pause button, and a button to open the link of an image.
Via our new beta feature, enterprise owners can now revoke pending member invitations from the pending invitations page within the enterprise account: https://github.com/enterprises/<enterprise>/pending_members. This beta feature only applies to enterprise member invitations not invites for enterprise administrators and outside collaborators.
To learn more, please read about viewing people in your enterprise.