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

docs/src/demos/Marks/Italic/index.spec.js

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+context('/api/marks/italic', () => {
+  before(() => {
+    cy.visit('/api/marks/italic')
+  })
+
+  beforeEach(() => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.setContent('<p>Example Text</p>')
+      editor.selectAll()
+    })
+  })
+
+  it('i tags should be transformed to em tags', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.setContent('<p><i>Example Text</i></p>')
+      expect(editor.getHTML()).to.eq('<p><em>Example Text</em></p>')
+    })
+  })
+
+  it('i tags with normal font style should be omitted', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.setContent('<p><i style="font-style: normal">Example Text</i></p>')
+      expect(editor.getHTML()).to.eq('<p>Example Text</p>')
+    })
+  })
+
+  it('generic tags with italic style should be transformed to strong tags', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.setContent('<p><span style="font-style: italic">Example Text</span></p>')
+      expect(editor.getHTML()).to.eq('<p><em>Example Text</em></p>')
+    })
+  })
+
+  it('the button should make the selected text italic', () => {
+    cy.get('.demo__preview button:first')
+      .click()
+
+    cy.get('.ProseMirror')
+      .find('em')
+      .should('contain', 'Example Text')
+  })
+
+  it('the button should toggle the selected text italic', () => {
+    cy.get('.demo__preview button:first')
+      .click()
+
+    cy.get('.ProseMirror')
+      .type('{selectall}')
+
+    cy.get('.demo__preview button:first')
+      .click()
+
+    cy.get('.ProseMirror em')
+      .should('not.exist')
+  })
+
+  it('the keyboard shortcut should make the selected text italic', () => {
+    cy.get('.ProseMirror')
+      .trigger('keydown', { modKey: true, key: 'i' })
+      .find('em')
+      .should('contain', 'Example Text')
+  })
+
+  it('the keyboard shortcut should toggle the selected text italic', () => {
+    cy.get('.ProseMirror')
+      .trigger('keydown', { modKey: true, key: 'i' })
+      .trigger('keydown', { modKey: true, key: 'i' })
+      .find('em')
+      .should('not.exist')
+  })
+})

docs/src/demos/Marks/Italic/index.vue

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+<template>
+  <div v-if="editor">
+    <button @click="editor.chain().focus().italic().run()" :class="{ 'is-active': editor.isActive('italic') }">
+      italic
+    </button>
+
+    <editor-content :editor="editor" />
+  </div>
+</template>
+
+<script>
+import { Editor } from '@tiptap/core'
+import { EditorContent } from '@tiptap/vue'
+import Document from '@tiptap/extension-document'
+import Paragraph from '@tiptap/extension-paragraph'
+import Text from '@tiptap/extension-text'
+import Italic from '@tiptap/extension-italic'
+
+export default {
+  components: {
+    EditorContent,
+  },
+
+  data() {
+    return {
+      editor: null,
+    }
+  },
+
+  mounted() {
+    this.editor = new Editor({
+      extensions: [
+        Document(),
+        Paragraph(),
+        Text(),
+        Italic(),
+      ],
+      content: `
+        <p>This isn’t italic.</p>
+        <p><em>This is italic.</em></p>
+        <p><i>And this.</i></p>
+        <p style="font-style: italic">This as well.</p>
+      `,
+    })
+  },
+
+  beforeDestroy() {
+    this.editor.destroy()
+  },
+}
+</script>