allow-pointer-lock: Allows the page to use the Pointer Lock API.allow-orientation-lock: Lets the resource lock the screen orientation.It also allows the page to receive BeforeUnloadEvent event. allow-modals: Allows the page to open modal windows by Window.alert(), nfirm(), Window.print() and Window.prompt(), while opening a is allowed regardless of this keyword. If this keyword is not used, form will be displayed as normal, but submitting it will not trigger input validation, sending data to a web server or closing a dialog.
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