Function stringWidth

mini-code-editor/cm/lib/codemirror.js:1544–1548

(str)

    }

    function stringWidth(str) {
      measure.innerHTML = "<pre><span>x</span></pre>";
      measure.firstChild.firstChild.firstChild.nodeValue = str;
      return measure.firstChild.firstChild.offsetWidth || 10;
    }
    // These are used to go from pixel positions to character
    // positions, taking varying character widths into account.
    function charFromX(line, x) {