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css var & auto width css triangle

https://codepen.io/xgqfrms/pen/PooeEbd

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1. css var

https://codepen.io/xgqfrms/pen/pooVNNP

2. js & getComputedStyle

https://developer.mozilla.org/en-US/docs/Web/API/Window/getComputedStyle

getComputedStyle(document.querySelector('span.search-box'), '::after').getPropertyValue('content');

https://stackoverflow.com/questions/44342065/how-to-get-a-dom-elements-before-content-with-javascript

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https://github.com/xgqfrms/vue/issues/59

https://github.com/vuejs-templates/webpack/issues/73#issuecomment-355149342

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