44 lines
1.1 KiB
JavaScript
44 lines
1.1 KiB
JavaScript
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(function flexible(window, document) {
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var docEl = document.documentElement
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var dpr = window.devicePixelRatio || 1
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// adjust body font size
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function setBodyFontSize() {
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if (document.body) {
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document.body.style.fontSize = (12 * dpr) + 'px'
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} else {
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document.addEventListener('DOMContentLoaded', setBodyFontSize)
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}
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}
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setBodyFontSize()
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// set 1rem = viewWidth / 10
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function setRemUnit() {
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var rem = docEl.clientWidth / 10
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docEl.style.fontSize = rem + 'px'
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}
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setRemUnit()
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// reset rem unit on page resize
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window.addEventListener('resize', setRemUnit)
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window.addEventListener('pageshow', function(e) {
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if (e.persisted) {
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setRemUnit()
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}
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})
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// detect 0.5px supports
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if (dpr >= 2) {
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var fakeBody = document.createElement('body')
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var testElement = document.createElement('div')
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testElement.style.border = '.5px solid transparent'
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fakeBody.appendChild(testElement)
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docEl.appendChild(fakeBody)
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if (testElement.offsetHeight === 1) {
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docEl.classList.add('hairlines')
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}
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docEl.removeChild(fakeBody)
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}
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}(window, document))
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