The set-top box supports basic CSS style attributes, such as: margin, padding, float, position, etc. There is not much difference in the rendering of basic style attributes among various manufacturers. However, there are large differences among manufacturers in supporting CSS3 and animation effects. Since the set-top box is a weak terminal type (weak hardware resources), the built-in supported animation functions are limited, and it is not a function that operators are currently required to support.
Similarly, in terms of the current application design requirements on the Internet, there are very few applications that use CSS3 and animation, and most of them stay in the laboratory demonstration stage.