1 files changed, 5 insertions, 0 deletions
diff --git a/coverage/html.py b/coverage/html.py
index d34aeac7..6fc49ff5 100644
--- a/coverage/html.py
+++ b/coverage/html.py
@@ -132,8 +132,13 @@ class HtmlReporter(Reporter):
 def escape(t):
     """HTML-escape the text in t."""
     return (t
+            # Convert HTML special chars into HTML entities.
             .replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;")
             .replace("'", "&#39;").replace('"', "&quot;")
+            # Convert runs of spaces: "      " -> "&nbsp; &nbsp; &nbsp; "
+            .replace("  ", "&nbsp; ")
+            # To deal with odd-length runs, convert the final pair of spaces
+            # so that "     " -> "&nbsp; &nbsp;&nbsp; "
             .replace("  ", "&nbsp; ")
         )