---
 nbconvert/exporters/tests/test_webpdf.py |    1 +
 nbconvert/tests/test_nbconvertapp.py     |    5 +++--
 setup.cfg                                |    4 ++++
 3 files changed, 8 insertions(+), 2 deletions(-)

--- a/nbconvert/exporters/tests/test_webpdf.py
+++ b/nbconvert/exporters/tests/test_webpdf.py
@@ -16,6 +16,7 @@ class TestWebPDFExporter(ExportersTestsB
 
     exporter_class = WebPDFExporter
 
+    @pytest.mark.network
     def test_export(self):
         """
         Can a TemplateExporter export something?
--- a/nbconvert/tests/test_nbconvertapp.py
+++ b/nbconvert/tests/test_nbconvertapp.py
@@ -146,6 +146,7 @@ class TestNbConvertApp(TestsBase):
             )
             assert os.path.isfile('notebook with spaces.pdf')
 
+    @pytest.mark.network
     def test_webpdf_with_chromium(self):
         """
         Generate PDFs if chromium allowed to be downloaded?
@@ -356,8 +357,8 @@ class TestNbConvertApp(TestsBase):
                 text = f.read()
                 assert 'celltag_mycelltag celltag_mysecondcelltag' in text
                 assert 'celltag_mymarkdowncelltag' in text
-            
-                
+
+
     def test_no_input(self):
         """
         Verify that the html has no input when given --no-input.
--- a/setup.cfg
+++ b/setup.cfg
@@ -8,3 +8,7 @@ license_file = LICENSE
 ignore =
     nbconvert/resources/style.min.css
     .circleci/*
+
+[tool:pytest]
+markers =
+    network: marks tests which require network connection