diff --git a/_test/extra.txt b/_test/extra.txt
index f194d69..41b1d7d 100644
--- a/_test/extra.txt
+++ b/_test/extra.txt
@@ -374,3 +374,9 @@ a* b c d *e*
 <p>a* b c d <em>e</em></p>
 //= = = = = = = = = = = = = = = = = = = = = = = =//
 
+24: HTML block tags can contain trailing spaces
+//- - - - - - - - -//
+<aaa >
+//- - - - - - - - -//
+<aaa >
+//= = = = = = = = = = = = = = = = = = = = = = = =//
diff --git a/parser/html_block.go b/parser/html_block.go
index 45c0fa2..db2cf11 100644
--- a/parser/html_block.go
+++ b/parser/html_block.go
@@ -93,7 +93,7 @@ var htmlBlockType5Close = []byte{']', ']', '>'}
 
 var htmlBlockType6Regexp = regexp.MustCompile(`^[ ]{0,3}</?([a-zA-Z0-9]+)(?:\s.*|>.*|/>.*|)\n?$`)
 
-var htmlBlockType7Regexp = regexp.MustCompile(`^[ ]{0,3}<(/)?([a-zA-Z0-9\-]+)(` + attributePattern + `*)(:?>|/>)\s*\n?$`)
+var htmlBlockType7Regexp = regexp.MustCompile(`^[ ]{0,3}<(/)?\s*([a-zA-Z0-9\-]+)(` + attributePattern + `*)\s*(:?>|/>)\s*\n?$`)
 
 type htmlBlockParser struct {
 }