demo: blogpost about CSS Variables

demoSite/layouts/posts/css-vars-showcase.html

@@ -1,32 +1,51 @@
 {{ define "head" }}
 <style>
-
+  .color-container {
+    background-color: var(--accent);
+    padding: 10px;
+    color: var(--accent-contrast-color)
+  }
 </style>
 {{ end }}{{ define "main" }}
 <div class="post">
   <!-- Common header, cover, etc. -->
   {{ partial "single_basic.html" . }}
 
-  <form oninput="color.value=colorpicker.value">
-    <output name="color" for="colorpicker">Color</output>
+  <form oninput="accentColor.value=accentColorPicker.value">
+    <output class="color-container" name="accentColor" for="accentColorPicker">#------</output>
     <label>
-      Pick a color
-      <input id="colorpicker" name="colorpicker" type="color" /> 
+      Pick accent color
+      <input id="accentColorPicker" name="accentColorPicker" type="color" />
     </label>
   </form>
-  
+  <form oninput="accentContrastColor.value=accentContrastColorPicker.value;">
+    <output class="color-container" name="accentContrastColor" for="accentContrastColorPicker">#------</output>
+    <label>
+      Pick accent contrast color
+      <input id="accentContrastColorPicker" name="accentContrastColorPicker" type="color" />
+    </label>
+  </form>
+
   <script defer>
-    const picker = document.getElementById("colorpicker"); 
     const root = document.querySelector(':root');
-    const listener = picker.addEventListener("input", () => {
-      if (picker.value) {
-        root.style.setProperty('--accent', picker.value);
+
+    const accentPicker = document.getElementById("accentColorPicker");
+    const accentListener = accentPicker.addEventListener("input", () => {
+      if (accentPicker.value) {
+        root.style.setProperty('--accent', accentPicker.value);
       }
     })
+
+    const accentContrastPicker = document.getElementById("accentContrastColorPicker");
+    const accentContrastListener = accentContrastPicker.addEventListener("input", () => {
+      if (accentContrastPicker.value) {
+        root.style.setProperty('--accent-contrast-color', accentContrastPicker.value);
+      }
+    }) 
   </script>
 
   {{ if eq .Type $.Site.Params.contentTypeName }} {{ partial
   "posts_pagination.html" . }} {{ end }} {{ if not (.Params.hideComments |
   default false) }} {{ partial "comments.html" . }} {{ end }}
 </div>
-{{ end }}
+{{ end }}