【V3】reset.css、rem.js

Reset CSS

/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
    display: block;
}
body {
    line-height: 1;
}
ol, ul {
    list-style: none;
}
blockquote, q {
    quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
    content: '';
    content: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}

rem.js

(function (doc, win) {
  var docEl = doc.documentElement
  var isIOS = navigator.userAgent.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/)
  var dpr = isIOS ? Math.min(win.devicePixelRatio, 3) : 1
  var scale = 1 / dpr
  var resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize'
  docEl.dataset.dpr = dpr
  var metaEl = doc.createElement('meta')
  metaEl.name = 'viewport'
  metaEl.content = 'initial-scale=' + scale + ',maximum-scale=' + scale + ', minimum-scale=' + scale
  docEl.firstElementChild.appendChild(metaEl)
  var recalc = function () {
    var width = docEl.clientWidth
    if (width / dpr > 750) {
      width = 750 * dpr
    }
    docEl.style.fontSize = 100 * (width / 750) + 'px'
  }
  recalc()
  if (!doc.addEventListener) return
  win.addEventListener(resizeEvt, recalc, false)
})(document, window)