minimum size. For example, it could be restricted to be between a quarter and

a half of one dimension of the screen.

When {{pictureInPictureElement}} is set, the Picture-in-Picture window MUST

be visible, even when the [=document=]'s {{Window}} is not in [=Window/focus|focused=] or the [=document=]'s [=Document/visibility state=] is "hidden". The user

agent SHOULD provide a way for users to manually close the Picture-in-Picture

window.

## Exit Picture-in-Picture ## {#exit-pip}

When the <dfn>exit Picture-in-Picture algorithm</dfn> is invoked,

## Interaction with Page Visibility ## {#page-visibility}

When {{pictureInPictureElement}} is set, the Picture-in-Picture window MUST

be visible, even when the <a>Document</a> is not in focus or hidden. The user

agent SHOULD provide a way for users to manually close the Picture-in-Picture

window.

The Picture-in-Picture window visibility MUST NOT be taken into account by the user agent to

determine if the <a>system visibility state</a> of a <a for="/">traversable navigable</a> has

changed.

The Picture-in-Picture window visibility MUST NOT be taken into account by the

user agent to determine if the <a>system visibility state</a> of a

<a for="/">traversable navigable</a> has changed.

## One Picture-in-Picture window ## {#one-pip-window}