Add Practice Page for Supporting High Contrast

content/practices/high-contrast/css/switch-color-scheme.css

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+button.color-scheme[role="switch"] {
+  display: block;
+  margin: 2px;
+  padding: 4px 4px 8px 8px;
+  border: 0 solid #005a9c;
+  border-radius: 5px;
+  width: 17em;
+  height: 3em;
+  text-align: left;
+  background-color: #e9e9e9;
+  color: #242424;
+}
+
+button.color-scheme[role="switch"] .label {
+  position: relative;
+  top: -3px;
+  display: inline-block;
+  padding: 0;
+  margin: 0;
+  width: 10em;
+  vertical-align: middle;
+  color: #242424;
+}
+
+button.color-scheme[role="switch"] svg {
+  display: inline-block;
+  width: 36px;
+  height: 20px;
+  position: relative;
+  top: 4px;
+}
+
+button.color-scheme[role="switch"] svg rect {
+  fill: #a1a1a1;
+  stroke-width: 2;
+  stroke: #757575;
+}
+
+button.color-scheme[role="switch"] svg circle.off {
+  display: block;
+  stroke: #757575;
+  fill: #fff;
+  fill-opacity: 1;
+}
+
+button.color-scheme[role="switch"] svg circle.on {
+  display: none;
+}
+
+button.color-scheme[role="switch"][aria-checked="true"] svg circle.off {
+  display: none;
+}
+
+button.color-scheme[role="switch"][aria-checked="true"] svg circle.on {
+  display: block;
+  stroke: #fff;
+  fill: #fff;
+  fill-opacity: 1;
+}
+
+button.color-scheme[role="switch"] span.off {
+  display: inline-block;
+}
+
+button.color-scheme[role="switch"] span.on {
+  display: none;
+}
+
+button.color-scheme[role="switch"][aria-checked="true"] span.off {
+  display: none;
+}
+
+button.color-scheme[role="switch"][aria-checked="true"] span.on {
+  display: inline-block;
+}
+
+button.color-scheme[role="switch"]:focus,
+button.color-scheme[role="switch"]:hover {
+  padding: 2px 2px 6px 6px;
+  border-width: 2px;
+  outline: none;
+  cursor: pointer;
+}
+
+@media (prefers-color-scheme: dark) {
+  button.color-scheme[role="switch"] {
+    background-color: #333;
+    color: #fff;
+  }
+
+  button.color-scheme[role="switch"] .label {
+    color: #fff;
+  }
+
+  button.color-scheme[role="switch"] svg rect {
+    fill: #36c;
+    stroke: #36c;
+  }
+
+  button.color-scheme[role="switch"] svg circle.off,
+  button.color-scheme[role="switch"] svg circle.on {
+    fill: #fff;
+    stroke: #fff;
+  }
+
+  button.color-scheme[role="switch"]:focus,
+  button.color-scheme[role="switch"]:hover {
+    border-color: #add8e6;
+  }
+}

content/practices/high-contrast/css/switch-increase-contrast.css

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+button.increase-contrast[role="switch"] {
+  display: block;
+  margin: 2px;
+  padding: 4px 4px 8px 8px;
+  border: 0 solid #005a9c;
+  border-radius: 5px;
+  width: 17em;
+  height: 3em;
+  text-align: left;
+  background-color: #e9e9e9;
+  color: #242424;
+}
+
+button.increase-contrast[role="switch"] .label {
+  position: relative;
+  top: -3px;
+  display: inline-block;
+  padding: 0;
+  margin: 0;
+  width: 10em;
+  vertical-align: middle;
+  color: #242424;
+}
+
+button.increase-contrast[role="switch"] svg {
+  display: inline-block;
+  width: 36px;
+  height: 20px;
+  position: relative;
+  top: 4px;
+}
+
+button.increase-contrast[role="switch"] svg rect {
+  fill: #a1a1a1;
+  stroke-width: 2;
+  stroke: #757575;
+}
+
+button.increase-contrast[role="switch"] svg circle.off {
+  display: block;
+  stroke: #757575;
+  fill: #fff;
+  fill-opacity: 1;
+}
+
+button.increase-contrast[role="switch"] svg circle.on {
+  display: none;
+}
+
+button.increase-contrast[role="switch"][aria-checked="true"] svg circle.off {
+  display: none;
+}
+
+button.increase-contrast[role="switch"][aria-checked="true"] svg circle.on {
+  display: block;
+  stroke: #061d3a;
+  fill: #fff;
+  fill-opacity: 1;
+}
+
+button.increase-contrast[role="switch"] span.off {
+  display: inline-block;
+}
+
+button.increase-contrast[role="switch"] span.on {
+  display: none;
+}
+
+button.increase-contrast[role="switch"][aria-checked="true"] span.off {
+  display: none;
+}
+
+button.increase-contrast[role="switch"][aria-checked="true"] span.on {
+  display: inline-block;
+}
+
+button.increase-contrast[role="switch"]:focus,
+button.increase-contrast[role="switch"]:hover {
+  padding: 2px 2px 6px 6px;
+  border-width: 2px;
+  outline: none;
+  cursor: pointer;
+}
+
+@media (prefers-contrast: more) {
+  button.increase-contrast[role="switch"] {
+    background-color: #eee;
+    color: #000;
+  }
+
+  button.increase-contrast[role="switch"] .label {
+    color: #000;
+  }
+
+  button.increase-contrast[role="switch"] svg rect {
+    fill: #0051a4;
+    stroke: #061d3a;
+  }
+
+  button.increase-contrast[role="switch"] svg circle.off,
+  button.increase-contrast[role="switch"] svg circle.on {
+    stroke: #061d3a;
+    fill: #fff;
+  }
+}