What will be the output of the following jquery ? $("div").css("width","300px").add("p").css("background-color","blue");

The above js code will set the width of all available DIVs to 300px and set the background-color of all all available DIVs and P tags to BLUE.

the div will takepx width and p  background blue

This above code will set the width of available div elements to 300px and add blue background color for all div and p elements.

set a width of 300px  for all div elements and blue for the back-ground color of all the p and div elements