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third_party/polymer/components/paper-spinner/paper-spinner-styles.html

 <!--
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 
 <dom-module id="paper-spinner-styles">
   <template>
     <style>
       /*
       /**************************/
       /* STYLES FOR THE SPINNER */
       /**************************/
 
       /*
        * Constants:
        *      ARCSIZE     = 270 degrees (amount of circle the arc takes up)
        *      ARCTIME     = 1333ms (time it takes to expand and contract arc)
        *      ARCSTARTROT = 216 degrees (how much the start location of the arc
        *                                should rotate each time, 216 gives us a
        *                                5 pointed star shape (it's 360/5 * 3).
        *                                For a 7 pointed star, we might do
        *                                360/7 * 3 = 154.286)
-       *      CONTAINERWIDTH = 28px
        *      SHRINK_TIME = 400ms
        */
 
       :host {
         display: inline-block;
         position: relative;
-        width: 28px; /* CONTAINERWIDTH */
-        height: 28px; /* CONTAINERWIDTH */
+        width: 28px;
+        height: 28px;
+
+        /* 360 * ARCTIME / (ARCSTARTROT + (360-ARCSIZE)) */
+        --paper-spinner-container-rotation-duration: 1568ms;
+
+        /* ARCTIME */
+        --paper-spinner-expand-contract-duration: 1333ms;
+
+        /* 4 * ARCTIME */
+        --paper-spinner-full-cycle-duration: 5332ms;
+
+        /* SHRINK_TIME */
+        --paper-spinner-cooldown-duration: 400ms;
       }
 
       #spinnerContainer {
         width: 100%;
         height: 100%;
 
         /* The spinner does not have any contents that would have to be
          * flipped if the direction changes. Always use ltr so that the
          * style works out correctly in both cases. */
         direction: ltr;
       }
 
       #spinnerContainer.active {
-        /* duration: 360 * ARCTIME / (ARCSTARTROT + (360-ARCSIZE)) */
-        -webkit-animation: container-rotate 1568ms linear infinite;
-        animation: container-rotate 1568ms linear infinite;
+        -webkit-animation: container-rotate var(--paper-spinner-container-rotation-duration) linear infinite;
+        animation: container-rotate var(--paper-spinner-container-rotation-duration) linear infinite;
       }
 
       @-webkit-keyframes container-rotate {
         to { -webkit-transform: rotate(360deg) }
       }
 
       @keyframes container-rotate {
         to { transform: rotate(360deg) }
       }
 
@@ skipping 22 matching lines @@
         border-color: var(--paper-spinner-layer-4-color, --google-green-500);
       }
 
       /**
        * IMPORTANT NOTE ABOUT CSS ANIMATION PROPERTIES (keanulee):
        *
        * iOS Safari (tested on iOS 8.1) does not handle animation-delay very well - it doesn't
        * guarantee that the animation will start _exactly_ after that value. So we avoid using
        * animation-delay and instead set custom keyframes for each color (as layer-2undant as it
        * seems).
-       *
-       * We write out each animation in full (instead of separating animation-name,
-       * animation-duration, etc.) because under the polyfill, Safari does not recognize those
-       * specific properties properly, treats them as -webkit-animation, and overrides the
-       * other animation rules. See https://github.com/Polymer/platform/issues/53.
        */
       .active .spinner-layer {
-        /* durations: 4 * ARCTIME */
-        -webkit-animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
-        animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
+        -webkit-animation-name: fill-unfill-rotate;
+        -webkit-animation-duration: var(--paper-spinner-full-cycle-duration);
+        -webkit-animation-timing-function: cubic-bezier(0.4, 0.0, 0.2, 1);
+        -webkit-animation-iteration-count: infinite;
+        animation-name: fill-unfill-rotate;
+        animation-duration: var(--paper-spinner-full-cycle-duration);
+        animation-timing-function: cubic-bezier(0.4, 0.0, 0.2, 1);
+        animation-iteration-count: infinite;
         opacity: 1;
       }
 
       .active .spinner-layer.layer-1 {
-        /* durations: 4 * ARCTIME */
-        -webkit-animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-1-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
-        animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-1-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
+        -webkit-animation-name: fill-unfill-rotate, layer-1-fade-in-out;
+        animation-name: fill-unfill-rotate, layer-1-fade-in-out;
       }
 
       .active .spinner-layer.layer-2 {
-        /* durations: 4 * ARCTIME */
-        -webkit-animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-2-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
-        animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-2-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
+        -webkit-animation-name: fill-unfill-rotate, layer-2-fade-in-out;
+        animation-name: fill-unfill-rotate, layer-2-fade-in-out;
       }
 
       .active .spinner-layer.layer-3 {
-        /* durations: 4 * ARCTIME */
-        -webkit-animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-3-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
-        animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-3-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
+        -webkit-animation-name: fill-unfill-rotate, layer-3-fade-in-out;
+        animation-name: fill-unfill-rotate, layer-3-fade-in-out;
       }
 
       .active .spinner-layer.layer-4 {
-        /* durations: 4 * ARCTIME */
-        -webkit-animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-4-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
-        animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-4-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
+        -webkit-animation-name: fill-unfill-rotate, layer-4-fade-in-out;
+        animation-name: fill-unfill-rotate, layer-4-fade-in-out;
       }
 
       @-webkit-keyframes fill-unfill-rotate {
-        12.5% { -webkit-transform: rotate(135deg);  } /* 0.5 * ARCSIZE */
-        25%   { -webkit-transform: rotate(270deg);  } /* 1   * ARCSIZE */
-        37.5% { -webkit-transform: rotate(405deg);  } /* 1.5 * ARCSIZE */
-        50%   { -webkit-transform: rotate(540deg);  } /* 2   * ARCSIZE */
-        62.5% { -webkit-transform: rotate(675deg);  } /* 2.5 * ARCSIZE */
-        75%   { -webkit-transform: rotate(810deg);  } /* 3   * ARCSIZE */
-        87.5% { -webkit-transform: rotate(945deg);  } /* 3.5 * ARCSIZE */
-        to    { -webkit-transform: rotate(1080deg); } /* 4   * ARCSIZE */
+        12.5% { -webkit-transform: rotate(135deg) } /* 0.5 * ARCSIZE */
+        25%   { -webkit-transform: rotate(270deg) } /* 1   * ARCSIZE */
+        37.5% { -webkit-transform: rotate(405deg) } /* 1.5 * ARCSIZE */
+        50%   { -webkit-transform: rotate(540deg) } /* 2   * ARCSIZE */
+        62.5% { -webkit-transform: rotate(675deg) } /* 2.5 * ARCSIZE */
+        75%   { -webkit-transform: rotate(810deg) } /* 3   * ARCSIZE */
+        87.5% { -webkit-transform: rotate(945deg) } /* 3.5 * ARCSIZE */
+        to    { -webkit-transform: rotate(1080deg) } /* 4   * ARCSIZE */
       }
 
       @keyframes fill-unfill-rotate {
-        12.5% { transform: rotate(135deg);  } /* 0.5 * ARCSIZE */
-        25%   { transform: rotate(270deg);  } /* 1   * ARCSIZE */
-        37.5% { transform: rotate(405deg);  } /* 1.5 * ARCSIZE */
-        50%   { transform: rotate(540deg);  } /* 2   * ARCSIZE */
-        62.5% { transform: rotate(675deg);  } /* 2.5 * ARCSIZE */
-        75%   { transform: rotate(810deg);  } /* 3   * ARCSIZE */
-        87.5% { transform: rotate(945deg);  } /* 3.5 * ARCSIZE */
-        to    { transform: rotate(1080deg); } /* 4   * ARCSIZE */
+        12.5% { transform: rotate(135deg) } /* 0.5 * ARCSIZE */
+        25%   { transform: rotate(270deg) } /* 1   * ARCSIZE */
+        37.5% { transform: rotate(405deg) } /* 1.5 * ARCSIZE */
+        50%   { transform: rotate(540deg) } /* 2   * ARCSIZE */
+        62.5% { transform: rotate(675deg) } /* 2.5 * ARCSIZE */
+        75%   { transform: rotate(810deg) } /* 3   * ARCSIZE */
+        87.5% { transform: rotate(945deg) } /* 3.5 * ARCSIZE */
+        to    { transform: rotate(1080deg) } /* 4   * ARCSIZE */
       }
 
-      /**
-       * HACK: Even though the intention is to have the current .spinner-layer at
-       * `opacity: 1`, we set it to `opacity: 0.99` instead since this forces Chrome
-       * to do proper subpixel rendering for the elements being animated. This is
-       * especially visible in Chrome 39 on Ubuntu 14.04. See:
-       *
-       * - https://github.com/Polymer/paper-spinner/issues/9
-       * - https://code.google.com/p/chromium/issues/detail?id=436255
-       */
       @-webkit-keyframes layer-1-fade-in-out {
-        from { opacity: 0.99; }
-        25% { opacity: 0.99; }
-        26% { opacity: 0; }
-        89% { opacity: 0; }
-        90% { opacity: 0.99; }
-        100% { opacity: 0.99; }
+        0% { opacity: 1 }
+        25% { opacity: 1 }
+        26% { opacity: 0 }
+        89% { opacity: 0 }
+        90% { opacity: 1 }
+        to { opacity: 1 }
       }
 
       @keyframes layer-1-fade-in-out {
-        from { opacity: 0.99; }
-        25% { opacity: 0.99; }
-        26% { opacity: 0; }
-        89% { opacity: 0; }
-        90% { opacity: 0.99; }
-        100% { opacity: 0.99; }
+        0% { opacity: 1 }
+        25% { opacity: 1 }
+        26% { opacity: 0 }
+        89% { opacity: 0 }
+        90% { opacity: 1 }
+        to { opacity: 1 }
       }
 
       @-webkit-keyframes layer-2-fade-in-out {
-        from { opacity: 0; }
-        15% { opacity: 0; }
-        25% { opacity: 0.99; }
-        50% { opacity: 0.99; }
-        51% { opacity: 0; }
+        0% { opacity: 0 }
+        15% { opacity: 0 }
+        25% { opacity: 1 }
+        50% { opacity: 1 }
+        51% { opacity: 0 }
+        to { opacity: 0 }
       }
 
       @keyframes layer-2-fade-in-out {
-        from { opacity: 0; }
-        15% { opacity: 0; }
-        25% { opacity: 0.99; }
-        50% { opacity: 0.99; }
-        51% { opacity: 0; }
+        0% { opacity: 0 }
+        15% { opacity: 0 }
+        25% { opacity: 1 }
+        50% { opacity: 1 }
+        51% { opacity: 0 }
+        to { opacity: 0 }
       }
 
       @-webkit-keyframes layer-3-fade-in-out {
-        from { opacity: 0; }
-        40% { opacity: 0; }
-        50% { opacity: 0.99; }
-        75% { opacity: 0.99; }
-        76% { opacity: 0; }
+        0% { opacity: 0 }
+        40% { opacity: 0 }
+        50% { opacity: 1 }
+        75% { opacity: 1 }
+        76% { opacity: 0 }
+        to { opacity: 0 }
       }
 
       @keyframes layer-3-fade-in-out {
-        from { opacity: 0; }
-        40% { opacity: 0; }
-        50% { opacity: 0.99; }
-        75% { opacity: 0.99; }
-        76% { opacity: 0; }
+        0% { opacity: 0 }
+        40% { opacity: 0 }
+        50% { opacity: 1 }
+        75% { opacity: 1 }
+        76% { opacity: 0 }
+        to { opacity: 0 }
       }
 
       @-webkit-keyframes layer-4-fade-in-out {
-        from { opacity: 0; }
-        65% { opacity: 0; }
-        75% { opacity: 0.99; }
-        90% { opacity: 0.99; }
-        100% { opacity: 0; }
+        0% { opacity: 0 }
+        65% { opacity: 0 }
+        75% { opacity: 1 }
+        90% { opacity: 1 }
+        to { opacity: 0 }
       }
 
       @keyframes layer-4-fade-in-out {
-        from { opacity: 0; }
-        65% { opacity: 0; }
-        75% { opacity: 0.99; }
-        90% { opacity: 0.99; }
-        100% { opacity: 0; }
-      }
-
-      /**
-       * Patch the gap that appear between the two adjacent div.circle-clipper while the
-       * spinner is rotating (appears on Chrome 38, Safari 7.1, and IE 11).
-       *
-       * Update: the gap no longer appears on Chrome when .spinner-layer's opacity is 0.99,
-       * but still does on Safari and IE.
-       */
-      .gap-patch {
-        position: absolute;
-        box-sizing: border-box;
-        top: 0;
-        left: 45%;
-        width: 10%;
-        height: 100%;
-        overflow: hidden;
-        border-color: inherit;
-      }
-
-      .gap-patch .circle {
-        width: 1000%;
-        left: -450%;
+        0% { opacity: 0 }
+        65% { opacity: 0 }
+        75% { opacity: 1 }
+        90% { opacity: 1 }
+        to { opacity: 0 }
       }
 
       .circle-clipper {
         display: inline-block;
         position: relative;
         width: 50%;
         height: 100%;
         overflow: hidden;
         border-color: inherit;
       }
 
-      .circle-clipper .circle {
-        width: 200%;
+      /**
+       * Patch the gap that appear between the two adjacent div.circle-clipper while the
+       * spinner is rotating (appears on Chrome 50, Safari 9.1.1, and Edge).
+       */
+      .spinner-layer::after {
+        left: 45%;
+        width: 10%;
+        border-top-style: solid;
       }
 
-      .circle {
+      .spinner-layer::after,
+      .circle-clipper::after {
+        content: '';
         box-sizing: border-box;
-        height: 100%;
-        border-width: var(--paper-spinner-stroke-width, 3px); /* STROKEWIDTH */
-        border-style: solid;
+        position: absolute;
+        top: 0;
+        border-width: var(--paper-spinner-stroke-width, 3px);
         border-color: inherit;
-        border-bottom-color: transparent !important;
         border-radius: 50%;
-        -webkit-animation: none;
-        animation: none;
-
-        @apply(--layout-fit);
       }
 
-      .circle-clipper.left .circle {
+      .circle-clipper::after {
+        bottom: 0;
+        width: 200%;
+        border-style: solid;
+        border-bottom-color: transparent !important;
+      }
+
+      .circle-clipper.left::after {
+        left: 0;
         border-right-color: transparent !important;
         -webkit-transform: rotate(129deg);
         transform: rotate(129deg);
       }
 
-      .circle-clipper.right .circle {
+      .circle-clipper.right::after {
         left: -100%;
         border-left-color: transparent !important;
         -webkit-transform: rotate(-129deg);
         transform: rotate(-129deg);
       }
 
-      .active .circle-clipper.left .circle {
-        /* duration: ARCTIME */
-        -webkit-animation: left-spin 1333ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
-        animation: left-spin 1333ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
+      .active .gap-patch::after,
+      .active .circle-clipper::after {
+        -webkit-animation-duration: var(--paper-spinner-expand-contract-duration);
+        -webkit-animation-timing-function: cubic-bezier(0.4, 0.0, 0.2, 1);
+        -webkit-animation-iteration-count: infinite;
+        animation-duration: var(--paper-spinner-expand-contract-duration);
+        animation-timing-function: cubic-bezier(0.4, 0.0, 0.2, 1);
+        animation-iteration-count: infinite;
       }
 
-      .active .circle-clipper.right .circle {
-        /* duration: ARCTIME */
-        -webkit-animation: right-spin 1333ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
-        animation: right-spin 1333ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
+      .active .circle-clipper.left::after {
+        -webkit-animation-name: left-spin;
+        animation-name: left-spin;
+      }
+
+      .active .circle-clipper.right::after {
+        -webkit-animation-name: right-spin;
+        animation-name: right-spin;
       }
 
       @-webkit-keyframes left-spin {
-        from { -webkit-transform: rotate(130deg); }
-        50% { -webkit-transform: rotate(-5deg); }
-        to { -webkit-transform: rotate(130deg); }
+        0% { -webkit-transform: rotate(130deg) }
+        50% { -webkit-transform: rotate(-5deg) }
+        to { -webkit-transform: rotate(130deg) }
       }
 
       @keyframes left-spin {
-        from { transform: rotate(130deg); }
-        50% { transform: rotate(-5deg); }
-        to { transform: rotate(130deg); }
+        0% { transform: rotate(130deg) }
+        50% { transform: rotate(-5deg) }
+        to { transform: rotate(130deg) }
       }
 
       @-webkit-keyframes right-spin {
-        from { -webkit-transform: rotate(-130deg); }
-        50% { -webkit-transform: rotate(5deg); }
-        to { -webkit-transform: rotate(-130deg); }
+        0% { -webkit-transform: rotate(-130deg) }
+        50% { -webkit-transform: rotate(5deg) }
+        to { -webkit-transform: rotate(-130deg) }
       }
 
       @keyframes right-spin {
-        from { transform: rotate(-130deg); }
-        50% { transform: rotate(5deg); }
-        to { transform: rotate(-130deg); }
+        0% { transform: rotate(-130deg) }
+        50% { transform: rotate(5deg) }
+        to { transform: rotate(-130deg) }
       }
 
       #spinnerContainer.cooldown {
-        /* duration: SHRINK_TIME */
-        -webkit-animation: container-rotate 1568ms linear infinite, fade-out 400ms cubic-bezier(0.4, 0.0, 0.2, 1);
-        animation: container-rotate 1568ms linear infinite, fade-out 400ms cubic-bezier(0.4, 0.0, 0.2, 1);
+        -webkit-animation: container-rotate var(--paper-spinner-container-rotation-duration) linear infinite, fade-out var(--paper-spinner-cooldown-duration) cubic-bezier(0.4, 0.0, 0.2, 1);
+        animation: container-rotate var(--paper-spinner-container-rotation-duration) linear infinite, fade-out var(--paper-spinner-cooldown-duration) cubic-bezier(0.4, 0.0, 0.2, 1);
       }
 
       @-webkit-keyframes fade-out {
-        from { opacity: 0.99; }
-        to { opacity: 0; }
+        0% { opacity: 1 }
+        to { opacity: 0 }
       }
 
       @keyframes fade-out {
-        from { opacity: 0.99; }
-        to { opacity: 0; }
+        0% { opacity: 1 }
+        to { opacity: 0 }
       }
     </style>
   </template>
 </dom-module>