web api instance property
ScreenDetailed: top property
Limited availabilitySecure context
The top read-only property of the
ScreenDetailed interface is a number representing the y-coordinate (top edge) of the total screen area inside the OS virtual screen arrangement, relative to the multi-screen origin.
This is equal to the true top edge, ignoring any OS UI element drawn at the top of the screen. Windows cannot be placed in those areas; to get the top coordinate of the screen area that windows can be placed in, use availTop.
[!NOTE] In Firefox, a non-standard implementation of the
topproperty is available on theScreeninterface. See the Non-standard example below for usage details, and see theScreenreference page for browser support information relating to the non-standard implementation.
Value
A number.
Examples
Window Management API example
// Available in browsers that support the Window Management API
const screenDetails = await window.getScreenDetails();
// Return the absolute top value of the first screen
const screen1Top = screenDetails.screens[0].top;
Non-standard example
// Available in Firefox
// Return the absolute top value of the current screen
const screenTop = window.screen.top;