ionic-framework/src/components/app/structure.scss

@import "../../globals.core";
@import "./z-index";


// App Structure
// --------------------------------------------------

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}

html {
  width: 100%;
  height: 100%;

  text-size-adjust: 100%;
}

body {
  @include user-select-none();

  position: fixed;
  overflow: hidden;

  margin: 0;
  padding: 0;

  width: 100%;
  max-width: 100%;
  height: 100%;
  max-height: 100%;

  -webkit-font-smoothing: antialiased;
  font-smoothing: antialiased;

  text-rendering: optimizeLegibility;

  -webkit-user-drag: none;

  -ms-content-zooming: none;
  touch-action: manipulation;

  word-wrap: break-word;

  text-size-adjust: none;
}


// Nav Container Structure
// --------------------------------------------------

ion-app,
ion-nav,
ion-tab,
ion-tabs,
.app-root {
  position: absolute;
  top: 0;
  left: 0;
  z-index: $z-index-page-container;
  display: block;
  overflow: hidden;

  width: 100%;
  height: 100%;
}

ion-tab scroll-cotent {
  display: none;
}

ion-tab {
  transform: translateY(-200%);
}

ion-tab.show-tab {
  transform: translateY(0);
}

ion-tab.show-tab scroll-cotent {
  display: block;
}


// Page Container Structure
// --------------------------------------------------

ion-page {
  position: absolute;
  top: 0;
  left: 0;
  display: block;

  width: 100%;
  height: 100%;

  // do not show, but still render so we can get dimensions
  opacity: 0;
}

ion-content {
  position: relative;
  top: 0;
  left: 0;
  display: block;

  width: 100%;
  height: 100%;
}

ion-page > ion-content {
  position: absolute;
}

ion-page scroll-content {
  // do not render the scroll-content at all until ready
  display: none;
}

ion-page.show-page {
  // show the page now that it's ready
  opacity: 1;
}

ion-page.show-page scroll-content {
  // render the content when ready
  display: block;
}


// Toolbar Container Structure
// --------------------------------------------------

ion-header {
  position: absolute;
  top: 0;
  left: 0;
  z-index: $z-index-toolbar;
  display: block;

  width: 100%;
}

ion-toolbar {
  position: relative;
  z-index: $z-index-toolbar;
}

ion-footer {
  position: absolute;
  bottom: 0;
  left: 0;
  z-index: $z-index-toolbar;
  display: block;

  width: 100%;
}

ion-tabbar {
  position: absolute;
  bottom: 0;
  left: 0;
  z-index: $z-index-toolbar;
  display: flex;

  width: 100%;

  // default to hidden until ready
  opacity: 0;
}

ion-tabbar.show-tabbar {
  opacity: 1;
}

[tabsPlacement=top] > ion-tabbar {
  top: 0;
  bottom: auto;
}


// Scrollable Content
// --------------------------------------------------

scroll-content {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: $z-index-scroll-content;
  display: block;

  overflow-x: hidden;
  overflow-y: scroll;
  -webkit-overflow-scrolling: touch;
  will-change: scroll-position;
}

ion-content.js-scroll > scroll-content {
  position: relative;

  min-height: 100%;

  overflow-x: initial;
  overflow-y: initial;
  -webkit-overflow-scrolling: auto;
  will-change: initial;
}

.disable-scroll ion-page scroll-content {
  overflow-y: hidden;
  overflow-x: hidden;
}


[nav-viewport],
[nav-portal],
[tab-portal],
.nav-decor {
  display: none;
}