From b1b896627a31dd4e365d59bbb8afb77f93e25afb Mon Sep 17 00:00:00 2001
From: Aad Versteden <madnificent@gmail.com>
Date: Thu, 31 Dec 2020 13:28:25 +0100
Subject: [PATCH] Add doc that received url parameter must be a valid URL

The `new URL(url)` statement will throw an error if the supplied
string is not a valid URL.  Adding a note to the function to clarify
that as requested by @Rob--W.
---
 apply-css/background.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/apply-css/background.js b/apply-css/background.js
index 039a6974..8846b0b1 100644
--- a/apply-css/background.js
+++ b/apply-css/background.js
@@ -27,6 +27,7 @@ function toggleCSS(tab) {
 
 /*
 Returns true only if the URL's protocol is in APPLICABLE_PROTOCOLS.
+Argument url must be a valid URL string.
 */
 function protocolIsApplicable(url) {
   const protocol = (new URL(url)).protocol;