Custom Element Practice Custom Element (自定義元素), Shadow DOM (影子 DOM), HTML Template (HTML 模板)
Here list two ways to implement "aspect ratio DOM design". One is using "padding" and another is using "aspect-ratio".
No-Library (pure JS), HTML, CSS, JavaScript
AngularJS 1.4.8, HTML, CSS, JavaScript
Use RxJS to create hover-dropdown-menu.
jQuery 1.9.1, HTML, CSS, JavaScript