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diff --git a/src/content/en/pastebins/2021/08/11/h1-spacing.adoc b/src/content/en/pastebins/2021/08/11/h1-spacing.adoc
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+= Spaces around h1 tags
+:updatedat: 2021-08-15
+
+_EDIT_: Apparently, the behaviour below is consistent between Firefox and
+Chromium for links, but not for `<h1>`.  My conclusion is that the `<h1>`
+behaviour is a Firefox quirk, but the `<a>` is expected.
+
+'''''
+
+The HTML below has selectable extra spaces after `<h1>` tags:
+
+[source,html]
+----
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>Spaces around h1 tags</title>
+  </head>
+  <body>
+    <main>
+      <h1>
+        With spaces around when selecting this heading
+      </h1>
+      <h1>Without spaces around</h1>
+      <p>
+        Is this expected behaviour?
+      </p>
+    </main>
+  </body>
+</html>
+----
+
+The rendered output is:
+
+With spaces around when selecting this heading
+
+Without spaces around
+
+Is this expected behaviour?
+
+'''''
+
+The same with links:
+
+[source,html]
+----
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>Spaces after a tags</title>
+  </head>
+  <body>
+    <main>
+      <p>
+        <a href="#">
+          With extra underlined space
+        </a>
+      </p>
+      <p>
+        <a href="#">Without extra underlined space</a>
+      </p>
+    </main>
+  </body>
+</html>
+----
+
+The rendered output is:
+
+With extra underlined space after the link.
+
+Without extra underlined space after the link.