--- a/vendor/golang.org/x/net/html/const.go	Wed Sep 18 19:17:42 2019 +0200
+++ b/vendor/golang.org/x/net/html/const.go	Sun Feb 16 18:54:01 2020 +0100
@@ -52,7 +52,6 @@
 	"iframe":     true,
 	"img":        true,
 	"input":      true,
-	"isindex":    true, // The 'isindex' element has been removed, but keep it for backwards compatibility.
 	"keygen":     true,
 	"li":         true,
 	"link":       true,