feature: add subscript and superscript extensions, docs and tests

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

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+context('/demos/Marks/Subscript', () => {
+  before(() => {
+    cy.visit('/demos/Marks/Subscript')
+  })
+
+  beforeEach(() => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.commands.setContent('<p>Example Text</p>')
+      cy.get('.ProseMirror').type('{selectall}')
+    })
+  })
+
+  it('should transform inline style to sub tags', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.commands.setContent('<p><span style="vertical-align: middle">Example Text</span></p>')
+      expect(editor.getHTML()).to.eq('<p><sub>Example Text</sub></p>')
+    })
+  })
+
+  it('sould omit inline style with a different vertical align', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.commands.setContent('<p><b style="vertical-align: middle">Example Text</b></p>')
+      expect(editor.getHTML()).to.eq('<p>Example Text</p>')
+    })
+  })
+
+  it('the button should make the selected text bold', () => {
+    cy.get('button:first')
+      .click()
+
+    cy.get('.ProseMirror')
+      .find('sub')
+      .should('contain', 'Example Text')
+  })
+
+  it('the button should toggle the selected text bold', () => {
+    cy.get('button:first').click()
+    cy.get('.ProseMirror').type('{selectall}')
+    cy.get('button:first').click()
+    cy.get('.ProseMirror sub').should('not.exist')
+  })
+})

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

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+<template>
+  <div v-if="editor">
+    <button @click="editor.chain().focus().toggleSubscript().run()" :class="{ 'is-active': editor.isActive('subscript') }">
+      subscript
+    </button>
+
+    <editor-content :editor="editor" />
+  </div>
+</template>
+
+<script>
+import { Editor, EditorContent } from '@tiptap/vue-2'
+import Document from '@tiptap/extension-document'
+import Paragraph from '@tiptap/extension-paragraph'
+import Text from '@tiptap/extension-text'
+import Subscript from '@tiptap/extension-subscript'
+
+export default {
+  components: {
+    EditorContent,
+  },
+
+  data() {
+    return {
+      editor: null,
+    }
+  },
+
+  mounted() {
+    this.editor = new Editor({
+      extensions: [
+        Document,
+        Paragraph,
+        Text,
+        Subscript,
+      ],
+      content: `
+        <p>This is regular text.</p>
+        <p><sub>This is subscript.</sub></p>
+        <p><span style="vertical-align: sub">And this.</span></p>
+      `,
+    })
+  },
+
+  beforeDestroy() {
+    this.editor.destroy()
+  },
+}
+</script>

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

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+context('/demos/Marks/Superscript', () => {
+  before(() => {
+    cy.visit('/demos/Marks/Superscript')
+  })
+
+  beforeEach(() => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.commands.setContent('<p>Example Text</p>')
+      cy.get('.ProseMirror').type('{selectall}')
+    })
+  })
+
+  it('should transform inline style to sup tags', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.commands.setContent('<p><span style="vertical-align: super">Example Text</span></p>')
+      expect(editor.getHTML()).to.eq('<p><sup>Example Text</sup></p>')
+    })
+  })
+
+  it('sould omit inline style with a different vertical align', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.commands.setContent('<p><span style="vertical-align: middle">Example Text</span></p>')
+      expect(editor.getHTML()).to.eq('<p>Example Text</p>')
+    })
+  })
+
+  it('the button should make the selected text bold', () => {
+    cy.get('button:first')
+      .click()
+
+    cy.get('.ProseMirror')
+      .find('sup')
+      .should('contain', 'Example Text')
+  })
+
+  it('the button should toggle the selected text bold', () => {
+    cy.get('button:first').click()
+    cy.get('.ProseMirror').type('{selectall}')
+    cy.get('button:first').click()
+    cy.get('.ProseMirror sup').should('not.exist')
+  })
+})

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

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+<template>
+  <div v-if="editor">
+    <button @click="editor.chain().focus().toggleSuperscript().run()" :class="{ 'is-active': editor.isActive('superscript') }">
+      superscript
+    </button>
+
+    <editor-content :editor="editor" />
+  </div>
+</template>
+
+<script>
+import { Editor, EditorContent } from '@tiptap/vue-2'
+import Document from '@tiptap/extension-document'
+import Paragraph from '@tiptap/extension-paragraph'
+import Text from '@tiptap/extension-text'
+import Superscript from '@tiptap/extension-superscript'
+
+export default {
+  components: {
+    EditorContent,
+  },
+
+  data() {
+    return {
+      editor: null,
+    }
+  },
+
+  mounted() {
+    this.editor = new Editor({
+      extensions: [
+        Document,
+        Paragraph,
+        Text,
+        Superscript,
+      ],
+      content: `
+        <p>This is regular text.</p>
+        <p><sup>This is superscript.</sup></p>
+        <p><span style="vertical-align: super">And this.</span></p>
+      `,
+    })
+  },
+
+  beforeDestroy() {
+    this.editor.destroy()
+  },
+}
+</script>