Media alternatives for text may be audio-only, video-only (including sign-language
      video), or audio-video. motion animation addition of steps between conditions to create the illusion of movement or to give a sense of a smooth transition Example For example, an element which moves into place or changes size while appearing is considered to be animated. An element which appears instantly without transitioning is not using animation. Motion animation does not include changes of color, blurring, or opacity which do not change the perceived size, shape, or position of the element. minimum bounding box [New] the smallest enclosing rectangle aligned to the horizontal axis within which all the points of a shape lie.