Firefox screencast sample casting a window, and the window itself is highlighted with a red border and shadow.
https://files.mastodon.online/media_attachments/files/113/984/108/723/791/043/original/9ef28223a896d86c.png
Another cool suggestion by @elkowar: you can now match windows recorded by an active window screencast. For example, to highlight the casted window with a different color.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.