What is the CSS property used to create shadows behind elements?Optionsshadow-effectelement-shadowtext-shadowbox-shadow

Which new feature of CSS 3 makes it possible to adjust the transparency of the elements?ARounded cornersBBorder ImagesCBox shadowDOpacity

What does the "box-sizing" property in CSS control?OptionsBorder sizeBox ShadowElement positioningHow the element's dimensions are calculated

What is the CSS property used to control the visibility of an element?Optionsdisplayhiddenopacityvisibility

Which CSS property is used to set the background color of an element?Optionsbg colorbg-colorcolor-backgroundbackground-color

Which CSS property is used to control the appearance of an element when it is hovered over by the mouse pointer?Optionshover-effecton-hoveractive:hover