Use the screen.colorDepth property in JavaScript to return a number of bits used to display a color on the window screen.
Example
You can try to run the following code to return the screen color depth in JavaScript.
<!DOCTYPE html> <html> <body> <script> document.write("Screen width: " + screen.width); document.write("<br>Screen height: " + screen.height); document.write("<br>Color Depth: " + screen.colorDepth); </script> </body> </html>