Trim unneeded whitespace from HTML output

2 files changed, 4 insertions, 0 deletions

diff --git a/CHANGES.rst b/CHANGES.rst
index e4ac711f..11644871 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -19,6 +19,8 @@ Unreleased
 
 - Development moved from `Bitbucket`_ to `GitHub`_.
 
+- HTML files no longer have trailing and extra whitespace.
+
 .. _Bitbucket: https://bitbucket.org/ned/coveragepy
 .. _GitHub: https://github.com/nedbat/coveragepy
 
diff --git a/coverage/html.py b/coverage/html.py
index 1bef93a1..65aac9c1 100644
--- a/coverage/html.py
+++ b/coverage/html.py
@@ -6,6 +6,7 @@
 import datetime
 import json
 import os
+import re
 import shutil
 
 import coverage
@@ -66,6 +67,7 @@ def read_data(fname):
 
 def write_html(fname, html):
     """Write `html` to `fname`, properly encoded."""
+    html = re.sub(r"(\A\s+)|(\s+$)", "", html, flags=re.MULTILINE)
     with open(fname, "wb") as fout:
         fout.write(html.encode('ascii', 'xmlcharrefreplace'))