This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
Window.sizeToContent() method sizes the window
according to its content. In order for it to work, the DOM content should be loaded when
this function is called—for example, once the
DOMContentLoaded event has
Since Firefox 20, the mimimal size of the window is clamped to prevent the window from being too small for the user to interact with.
This feature is not part of any specification.
BCD tables only load in the browser