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Chrome contains built-in features to block pop-ups. Sometimes a pop-up or two will get beyond the blocker, but for the most part this function will keep you pretty safe. This option is called "Content Settings" in iOS. This option is called "Block Pop-ups" in iOS. This option should be turned on by default, but it may have inadvertently been disabled. Turning it off now should protect you from pop-ups in the future.
Click the menu. Select "Settings". Select "Site Settings". Click "Pop-ups". Tap the slider to the On position.