window.getSelection() returns null when contenteditable loses focus

Phenomenon

When a contenteditable region loses focus, window.getSelection() may return null in Safari, even if there was a valid selection before the focus loss. This makes it difficult to preserve or work with selections.

Reproduction example

1. Create a contenteditable div.
2. Select some text within it.
3. Click outside the contenteditable to remove focus.
4. Call window.getSelection().
5. Observe the return value.

Observed behavior

• In Safari on macOS, window.getSelection() returns null after focus loss.
• The selection information is lost.
• There is no way to retrieve the previous selection state.

Expected behavior

• window.getSelection() should return a valid Selection object even after focus loss.
• Or, there should be a way to preserve selection state before focus loss.
• Selection information should be accessible when needed.