Better handle hiding of about part

composer.json

@@ -1,7 +1,7 @@
 {
     "name": "fwdekker/death-notifier",
     "description": "Get notified when a famous person dies.",
-    "version": "0.19.5", "_comment_version": "Also update version in `package.json`!",
+    "version": "0.19.8", "_comment_version": "Also update version in `package.json`!",
     "type": "project",
     "license": "MIT",
     "homepage": "https://git.fwdekker.com/tools/death-notifier",

package.json

@@ -1,6 +1,6 @@
 {
     "name": "death-notifier",
-    "version": "0.19.7", "_comment_version": "Also update version in `composer.json`!",
+    "version": "0.19.8", "_comment_version": "Also update version in `composer.json`!",
     "description": "Get notified when a famous person dies.",
     "author": "Florine W. Dekker",
     "browser": "dist/bundle.js",

src/main/index.html

@@ -56,7 +56,7 @@
                 <a href="./">Click here to return to the main page.</a>
             </p>
 
-            <article id="about-part">
+            <article id="about-part" class="hidden">
                 <header>
                     <hgroup>
                         <h2>About</h2>

src/main/js/Main.ts

@@ -254,7 +254,7 @@ function handleAction(params: URLSearchParams): void {
 
     if (!params_are_valid) {
         sharedHomeLink.classList.remove("hidden");
-        showMessageError(sharedMessageElement, `Invalid URL.`);
+        showMessageError(sharedMessageElement, "Invalid URL.");
     }
 }