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Here are directions from Apple:
Devices using iOS 7.0.3 or later:
Go to Settings > Safari> Passwords & Autofill > Saved Passwords.
Tap the website whose password you want to view.
Enter your device passcode.
Macs using OS X Mavericks v10.9 or later:
Choose Safari > Preferences, then click Passwords.
Select the website whose password you want to view.
Select the “Show passwords for selected websites” checkbox.
Enter your system password.