browsernizr/test/css/remunit.js

Modernizr wrapper for use with browserify

/*!
{
  "name": "CSS Font rem Units",
  "caniuse": "rem",
  "authors": ["nsfmc"],
  "property": "cssremunit",
  "tags": ["css"],
  "builderAliases": ["css_remunit"],
  "notes": [{
    "name": "W3C Spec",
    "href": "https://www.w3.org/TR/css3-values/#relative0"
  },{
    "name": "Font Size with rem by Jonathan Snook",
    "href": "https://snook.ca/archives/html_and_css/font-size-with-rem"
  }]
}
!*/
var Modernizr = require('./../../lib/Modernizr.js');
var createElement = require('./../../lib/createElement.js');
  // "The 'rem' unit ('root em') is relative to the computed
  // value of the 'font-size' value of the root element."
  // you can test by checking if the prop was ditched

  Modernizr.addTest('cssremunit', function() {
    var style = createElement('a').style;
    try {
      style.fontSize = '3rem';
    }
    catch (e) {}
    return (/rem/).test(style.fontSize);
  });