Add 4 new browser snippets

triggerEvent - trigger an event on an element, insertAfter & insertBefore - parse and insert HTML after or before an element respectively, elementContains - checks if an element contains another element

test/elementContains/elementContains.js

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+const elementContains = (parent, child) => parent !== child && parent.contains(child);
+module.exports = elementContains;

test/elementContains/elementContains.test.js

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+const expect = require('expect');
+const elementContains = require('./elementContains.js');
+
+test('elementContains is a Function', () => {
+  expect(elementContains).toBeInstanceOf(Function);
+});

test/insertAfter/insertAfter.js

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+const insertAfter = (el, htmlString) => el.insertAdjacentHTML('afterend', htmlString);
+module.exports = insertAfter;

test/insertAfter/insertAfter.test.js

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+const expect = require('expect');
+const insertAfter = require('./insertAfter.js');
+
+test('insertAfter is a Function', () => {
+  expect(insertAfter).toBeInstanceOf(Function);
+});

test/insertBefore/insertBefore.js

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+const insertBefore = (el, htmlString) => el.insertAdjacentHTML('beforebegin', htmlString);
+module.exports = insertBefore;

test/insertBefore/insertBefore.test.js

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+const expect = require('expect');
+const insertBefore = require('./insertBefore.js');
+
+test('insertBefore is a Function', () => {
+  expect(insertBefore).toBeInstanceOf(Function);
+});

test/triggerEvent/triggerEvent.js

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+const triggerEvent = (el, eventType, detail = undefined) => el.dispatchEvent(new CustomEvent(eventType, {detail: detail}));
+module.exports = triggerEvent;

test/triggerEvent/triggerEvent.test.js

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+const expect = require('expect');
+const triggerEvent = require('./triggerEvent.js');
+
+test('triggerEvent is a Function', () => {
+  expect(triggerEvent).toBeInstanceOf(Function);
+});