twbs--bootstrap/scss/_reboot.scss

//
// Scaffolding
// --------------------------------------------------


// Reset the box-sizing
//
// Heads up! This reset may cause conflicts with some third-party widgets.
// For recommendations on resolving such conflicts, see
// http://getbootstrap.com/getting-started/#third-box-sizing
// Credit: Jon Neal & CSS-Tricks
// http://css-tricks.com/inheriting-box-sizing-probably-slightly-better-best-practice/

html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}


// Make viewport responsive
//
// @viewport is supposed to eventually replace <meta name="viewport">. It's manually prefixed for forward-compatibility.
//
// @viewport is also needed because IE 10+ doesn't honor <meta name="viewport"> in some cases.
// (See http://timkadlec.com/2012/10/ie10-snap-mode-and-responsive-design/)
//
// However, `device-width` is broken on IE 10 on Windows (Phone) 8,
// (see http://timkadlec.com/2013/01/windows-phone-8-and-device-width/
// and https://github.com/twbs/bootstrap/issues/10497)
// and the fix for that involves a snippet of JavaScript to sniff the user agent and apply some conditional CSS.
// See http://getbootstrap.com/getting-started/#support-ie10-width for the relevant hack.

@-moz-viewport      { width: device-width; }
@-ms-viewport       { width: device-width; }
@-o-viewport        { width: device-width; }
@-webkit-viewport   { width: device-width; }
@viewport           { width: device-width; }


// Reset HTML, body, and more

html {
  font-size: $font-size-root;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
}

body {
  font-family: $font-family-base;
  font-size: $font-size-base;
  line-height: $line-height-base;
  color: $text-color;
  background-color: $body-bg;
}

input,
button,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}


// Links

a {
  color: $link-color;
  text-decoration: none;

  @include hover-focus {
    color: $link-hover-color;
    text-decoration: $link-hover-decoration;
  }

  &:focus {
    @include tab-focus();
  }
}


// Images

img {
  vertical-align: middle;
}


// iOS "clickable elements" fix for role="button"
//
// Fixes "clickability" issue (and more generally, the firing of events such as focus as well)
// for traditionally non-focusable elements with role="button"
// see https://developer.mozilla.org/en-US/docs/Web/Events/click#Safari_Mobile
// Upstream patch for normalize.css submitted: https://github.com/necolas/normalize.css/pull/379 - remove this fix once that is merged

[role="button"] {
  cursor: pointer;
}