diff --git a/godoc/server.go b/godoc/server.go
index 3ebff5c5..95b47754 100644
--- a/godoc/server.go
+++ b/godoc/server.go
@@ -644,7 +644,7 @@ func formatGoSource(buf *bytes.Buffer, text []byte, links []analysis.Link, patte
 		// The first tab for the code snippet needs to start in column 9, so
 		// it indents a full 8 spaces, hence the two nbsp's. Otherwise the tab
 		// character only indents about two spaces.
-		fmt.Fprintf(saved, `<span id="L%d" class="ln" data-content="%6d">&nbsp;&nbsp;</span>`, n, n)
+		fmt.Fprintf(saved, `<span id="L%d" class="ln">%6d&nbsp;&nbsp;</span>`, n, n)
 		n++
 		saved.Write(line)
 		saved.WriteByte('\n')
diff --git a/godoc/static/static.go b/godoc/static/static.go
index dec963a0..14739d80 100644
--- a/godoc/static/static.go
+++ b/godoc/static/static.go
@@ -2915,11 +2915,7 @@ pre .ln {
 	-ms-user-select: none;
 	user-select: none;
 }
-.ln::before {
-	/* Inserting the line numbers as a ::before pseudo-element avoids making
-	 * them selectable; it's the trick Github uses as well. */
-	content: attr(data-content);
-}
+
 body {
 	color: #222;
 }
diff --git a/godoc/static/style.css b/godoc/static/style.css
index e4d1e4c3..79989eea 100644
--- a/godoc/static/style.css
+++ b/godoc/static/style.css
@@ -37,11 +37,7 @@ pre .ln {
 	-ms-user-select: none;
 	user-select: none;
 }
-.ln::before {
-	/* Inserting the line numbers as a ::before pseudo-element avoids making
-	 * them selectable; it's the trick Github uses as well. */
-	content: attr(data-content);
-}
+
 body {
 	color: #222;
 }