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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) {
- document.body.style.fontSize = 12 * dpr + "px";
- } else {
- document.addEventListener("DOMContentLoaded", setBodyFontSize);
- }
- }
- setBodyFontSize();
- // set 1rem = viewWidth / 10
- function setRemUnit() {
- var rem = docEl.clientWidth / 24;
- 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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