From 84cdd2f4f0d1f23e755d8e8f1610d6e0638cb96c Mon Sep 17 00:00:00 2001
From: Chris Hill-Scott <me@quis.cc>
Date: Sun, 20 Dec 2015 00:00:01 +0000
Subject: [PATCH] Add Javascript feature detection for `oninput`
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This commit adds a feature detection for the `oninput` event, which isn’t
supported in older browsers[1].

This means that the code that highlights placeholders will only be run in
browsers that support the `oninput` event.

1. http://caniuse.com/#feat=input-event
---
 app/assets/javascripts/highlightTags.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/app/assets/javascripts/highlightTags.js b/app/assets/javascripts/highlightTags.js
index 2a6d7c34d..472d479c7 100644
--- a/app/assets/javascripts/highlightTags.js
+++ b/app/assets/javascripts/highlightTags.js
@@ -1,6 +1,10 @@
 (function(Modules) {
   "use strict";
 
+  if (
+    !('oninput' in document.createElement('input'))
+  ) return;
+
   const tagPattern = /\(\([^\)\(]+\)\)/g;
 
   Modules.HighlightTags = function() {