VisiblePosition currentPos = ... // assume we have a current position VisiblePosition prevPos = currentPos.previous();
VisiblePosition currentPos = ... // assume we have a current position while (!currentPos.atStart()) { VisiblePosition prevPos = currentPos.previous(); // do something with prevPos currentPos = prevPos; }In this example, we use the `previous()` method in a loop to iterate through all the positions preceding the current position. We keep calling `previous()` and doing something with each resulting position until we reach the beginning of the DOM tree (i.e., when `currentPos.atStart()` returns `true`). These code examples likely belong to a package/library related to web development or HTML parsing, possibly something like the WebCore library used in the WebKit engine.