Web Components & HTML5 & template & slot
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/slot
https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_templates_and_slots
https://developer.mozilla.org/en-US/docs/Web/API/Element/slot
demo
https://codepen.io/xgqfrms/pen/xoWvyL
https://www.cnblogs.com/xgqfrms/p/10979925.html
HTML-imports
https://cdn.xgqfrms.xyz/HTML-imports/templates/index.html
refs
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