To avoid this, sites that do not expect to be used in frames are encouraged to only enable their interface if they detect that they are not in a frame (e.g. by comparing the window object to the value of the top attribute).
https://html.spec.whatwg.org/dev/introduction.html#is-this-html5?
To avoid this, sites that do not expect to be used in frames are encouraged to only enable their interface if they detect that they are not in a frame (e.g. by comparing the window object to the value of the top attribute). https://html.spec.whatwg.org/dev/introduction.html#is-this-html5?