move everything around, add more content and a first test for images

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

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+context('/examples/focus', () => {
+  before(() => {
+    cy.visit('/examples/focus')
+  })
+
+  it('should have class', () => {
+    cy.get('.ProseMirror p:first').should('have.class', 'has-focus')
+  })
+})

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

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+<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 Focus from '@tiptap/extension-focus'
+
+export default {
+  components: {
+    EditorContent,
+  },
+
+  data() {
+    return {
+      editor: null,
+    }
+  },
+
+  mounted() {
+    this.editor = new Editor({
+      extensions: [
+        Document(),
+        Paragraph(),
+        Text(),
+        Focus({
+          className: 'has-focus',
+          nested: true,
+        }),
+      ],
+      autoFocus: true,
+      content: `
+        <p>
+          The focus extension adds a class to the focused node only. That enables you to add a custom styling to just that node. By default, it’ll add <code>.has-focus</code>, even to nested nodes.
+        </p>
+        <p>
+          Nested elements will be focused with the default setting nested: true. Otherwise the whole item will get the focus class, even when just a single nested item is selected.
+        </p>
+      `,
+    })
+  },
+
+  beforeDestroy() {
+    this.editor.destroy()
+  },
+}
+</script>
+
+<style lang="scss">
+.has-focus {
+  border-radius: 3px;
+  box-shadow: 0 0 0 3px #68CEF8;
+}
+</style>

docs/src/demos/Nodes/Image/index.spec.js

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+context('/api/nodes/image', () => {
+  before(() => {
+    cy.visit('/api/nodes/image')
+  })
+
+  beforeEach(() => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.setContent('<p>Example Text</p>')
+      editor.selectAll()
+    })
+  })
+
+  it('should add an img tag with the correct URL', () => {
+    cy.window().then(win => {
+      cy.stub(win, 'prompt').returns('foobar.png')
+
+      cy.get('.demo__preview button:first')
+        .click()
+
+      cy.window().its('prompt').should('be.called')
+
+      cy.get('.ProseMirror')
+        .find('img')
+        .should('have.attr', 'src', 'foobar.png')
+    })
+  })
+})