scrollamount controls the speed of text: higher the Marquee-speed. One loop of marquee-style:slide.The initial state (1) has all content outside the box to the right. Controlling the Speed of Marquee Animations (-wap-marquee-speed Property) The -wap-marquee-speed property is used to specify the speed of a marquee animation. CSS3 enables you to produce marquee effects on the content of HTML elements.. 19.4. Firstly I have a html marque: