add content to the gapcursor page

docs/src/demos/Extensions/Gapcursor/index.spec.js

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+context('/examples/gapcursor', () => {
+  before(() => {
+    cy.visit('/examples/gapcursor')
+  })
+})

docs/src/demos/Extensions/Gapcursor/index.vue

@@ -0,0 +1,77 @@
+<template>
+  <div>
+    <editor-content :editor="editor" />
+  </div>
+</template>
+
+<script>
+import { Editor, EditorContent } from '@tiptap/vue-starter-kit'
+import Document from '@tiptap/extension-document'
+import Paragraph from '@tiptap/extension-paragraph'
+import Text from '@tiptap/extension-text'
+import Gapcursor from '@tiptap/extension-focus'
+import Image from '@tiptap/extension-image'
+
+export default {
+  components: {
+    EditorContent,
+  },
+
+  data() {
+    return {
+      editor: null,
+    }
+  },
+
+  mounted() {
+    this.editor = new Editor({
+      extensions: [
+        Document(),
+        Paragraph(),
+        Text(),
+        Image(),
+        Gapcursor(),
+      ],
+      content: `
+        <p>Try to set the cursor behind the image!</p>
+        <img src="https://source.unsplash.com/8xznAGy4HcY/800x400" />
+      `,
+    })
+  },
+
+  beforeDestroy() {
+    this.editor.destroy()
+  },
+}
+</script>
+
+<style lang="scss">
+/* Copied form the original prosemirror-gapcursor plugin by Marijn Haverbeke */
+/* https://github.com/ProseMirror/prosemirror-gapcursor/blob/master/style/gapcursor.css */
+
+.ProseMirror-gapcursor {
+  display: none;
+  pointer-events: none;
+  position: absolute;
+}
+
+.ProseMirror-gapcursor:after {
+  content: "";
+  display: block;
+  position: absolute;
+  top: -2px;
+  width: 20px;
+  border-top: 1px solid black;
+  animation: ProseMirror-cursor-blink 1.1s steps(2, start) infinite;
+}
+
+@keyframes ProseMirror-cursor-blink {
+  to {
+    visibility: hidden;
+  }
+}
+
+.ProseMirror-focused .ProseMirror-gapcursor {
+  display: block;
+}
+</style>