dist/scripts/vendor.min.js
function compile (tElement, tAttrs) {
    var wrapper = angular.element(tElement[0].getElementsByClassName('md-slider-wrapper'));

    var tabIndex = tAttrs.tabindex || 0;
    wrapper.attr('tabindex', tabIndex);

    if (tAttrs.disabled || tAttrs.ngDisabled) wrapper.attr('tabindex', -1);

    tElement.attr('role', 'slider');

    $mdAria.expect(tElement, 'aria-label');

    return postLink;
  }
function compile (tElement, tAttrs) {
    var wrapper = angular.element(tElement[0].getElementsByClassName('md-slider-wrapper'));

    var tabIndex = tAttrs.tabindex || 0;
    wrapper.attr('tabindex', tabIndex);

    if (tAttrs.disabled || tAttrs.ngDisabled) wrapper.attr('tabindex', -1);

    tElement.attr('role', 'slider');

    $mdAria.expect(tElement, 'aria-label');

    return postLink;
  }
********************************************************** Private Methods **********************************************************