meter and progress

What’s the difference between the meter element and the progress element?

Answer:

The meter element represents a scalar measurement within a known range, or a fractional value. This element isn’t a good fit to measure something like external temperature because it doesn’t have a fixed range. However, meter can be used to describe the occupied memory of a hard disk.

The progress element is used to show the completion progress of a task. Unlike the meter element, the progress described by progress can be indeterminate. For example you could describe that a given task is progressing but that it is unknown when the task will be completed.