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

snippets/triggerEvent.md

@@ -0,0 +1,16 @@
+### triggerEvent
+
+Triggers a specific event on a given element, optionally passing custom data.
+
+Use `new CustomEvent()` to create an event from the specified `eventType` and details.
+Use `el.dispatchEvent()` to trigger the newly created event on the given element.
+Omit the third argument, `detail`, if you do not want to pass custom data to the triggered event.
+
+```js
+const triggerEvent = (el, eventType, detail = undefined) => el.dispatchEvent(new CustomEvent(eventType, {detail: detail}));
+```
+
+```js
+triggerEvent(document.getElementById('myId'),'click');
+triggerEvent(document.getElementById('myId'),'click', {username: 'bob'});
+```