Quantified
Work is currently happening, and we have some information on its progression.
By default, the progression is stored as the ratio of how much work has been done so far and the total amount of work expected. This ratio is available in two formats, normalized and percent. If this ratio of work is enough for your usage, see loading.
New implementations of this interface can be provided by downstream users to provide more information (e.g. bandwidth, estimated time of completion…).