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- (function flexible (window, document) {
- var docEl = document.documentElement
- var dpr = window.devicePixelRatio || 1
-
- // adjust body font size
- function setBodyFontSize () {
- if (document.body) {
- }
- else {
- document.addEventListener('DOMContentLoaded', setBodyFontSize)
- }
- }
- setBodyFontSize();
-
- // set 1rem = viewWidth / 10
- function setRemUnit () {
- var rem = docEl.clientWidth / 7.5
- docEl.style.fontSize = rem + 'px'
- }
-
- setRemUnit()
-
- // reset rem unit on page resize
- window.addEventListener('resize', setRemUnit)
- window.addEventListener('pageshow', function (e) {
- if (e.persisted) {
- setRemUnit()
- }
- })
-
- // detect 0.5px supports
- if (dpr >= 2) {
- var fakeBody = document.createElement('body')
- var testElement = document.createElement('div')
- testElement.style.border = '.5px solid transparent'
- fakeBody.appendChild(testElement)
- docEl.appendChild(fakeBody)
- if (testElement.offsetHeight === 1) {
- docEl.classList.add('hairlines')
- }
- docEl.removeChild(fakeBody)
- }
- }(window, document))
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