Windows 11 Snipping Tool video trimming feature.

The redlines were needed custom components and optional for established components from the UI library. As you can see in the next picture, it's used to make sure the coded components match the design mockups as close as possible. There is a variation of this where we attach a guideline on how to translate design redlines to the WinUI XAML APIs for the dev to understand it better. In other words, whatever makes sense for the dev team.

The accessibility documentation were needed to signed off by the accessibility before we handed off the Engg. It includes the detailed behaviors of the controls when screenreader and keyboarding assistive devices are interacting with the UI. Once the feature are shipped, the accessibility would occasionally test the feature and file accessbility bugs as needed; and they also give an accessibility score to bring it into our attention.

The full-spec document were written and iterated by the PM and his/her peers; I attached the high fidelity mockups in the feature details section. The document were included in the 'package' that the design and product team hand-off to engineering team.