An estimate, as a percentage, of the amount of content that is currently loaded.
- macOS 10.2–10.14Deprecated
A number ranging from
1 and, once a load completes,
1 until a new load starts, at which point it resets to
The value is an estimate based on the total number of bytes expected to be received for a document, including all its possible subresources. For more accurate load progress information, implement delegates conforming to the WebFrameLoadDelegate and WebResourceLoadDelegate informal protocols.