(The first requirement is that this is not a popular science article on Web Components. If you don't understand this much, you are recommended to read AGuide to Web Components first. There is an old saying - "It is better to teach people how to fish than to teach people how to fish". If you compare components to "fish", for front-end developers, the HTML specification arranged by W3C and the browser manufacturer's implementation are "fish" rather than "fish". Developers create various components through existing technology when their needs are not satisfied. Although they are satisfied with the needs in the short term, they are severely lacking of specifications, As a result, there are countless similar implementations of the same component, but they cannot reuse each other, which largely limits the maximum value of componentization - reuse. WebComponents has taken a big step forward in component standardization. 58fenlei58 classification network)