fix: Replace marker example (#2585)

* chore: check in marker example cleanly

* chore: check in marker example cleanly

Author: bsmth

live-examples/css-examples/pseudo-element/marker.css

@@ -0,0 +1,4 @@
+li::marker {
+  content: '✝ ';
+  font-size: 1.2em;
+}

live-examples/css-examples/pseudo-element/marker.html

@@ -0,0 +1,10 @@
+<p>Group known as Mercury Seven:</p>
+<ul>
+  <li>Malcolm Scott Carpenter</li>
+  <li>Leroy Gordon (Gordo) Cooper Jr.</li>
+  <li>John Herschel Glenn Jr.</li>
+  <li>Virgil Ivan (Gus) Grissom</li>
+  <li>Walter Marty (Wally) Schirra Jr.</li>
+  <li>Alan Bartlett Shepard Jr.</li>
+  <li>Donald Kent (Deke) Slayton</li>
+</ul>

live-examples/css-examples/pseudo-element/meta.json

@@ -65,6 +65,15 @@
       "defaultTab": "css",
       "height": "tabbed-shorter"
     },
+    "marker": {
+      "exampleCode": "./live-examples/css-examples/pseudo-element/marker.html",
+      "cssExampleSrc": "./live-examples/css-examples/pseudo-element/marker.css",
+      "fileName": "pseudo-element-marker.html",
+      "title": "HTML Demo: ::marker",
+      "type": "tabbed",
+      "defaultTab": "css",
+      "height": "tabbed-shorter"
+    },
     "placeholder": {
       "exampleCode": "./live-examples/css-examples/pseudo-element/placeholder.html",
       "cssExampleSrc": "./live-examples/css-examples/pseudo-element/placeholder.css",