It is very similar to the base class MarkupContainer, except that the markup type is defined to be HTML.

它非常类似于基类MarkupContainer，只不过标记类型被定义成html。

youdao

While still going through the typically painfully slow standardization process, one of the promises of HTML5 (hypertext markup language) is it could greatly simplify the process of porting apps from one type of device to another.

FORBES: Automotive/Tech Companies Trying to Bring the Web to the Car