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diff --git a/crocoite/test_html.py b/crocoite/test_html.py
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+# Copyright (c) 2017 crocoite contributors
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import asyncio
+import pytest, html5lib
+from html5lib.serializer import HTMLSerializer
+from html5lib.treewalkers import getTreeWalker
+from aiohttp import web
+
+from .html import StripTagFilter, StripAttributeFilter, ChromeTreeWalker
+from .test_devtools import tab, browser
+
+def test_strip_tag ():
+    d = html5lib.parse ('<a>barbaz<b>foobar</b>.</a><b>foobar</b>.<b attr=1><c></c>')
+    stream = StripTagFilter (getTreeWalker ('etree')(d), ['b', 'c'])
+    serializer = HTMLSerializer ()
+    assert serializer.render (stream) == '<a>barbaz.</a>.'
+
+def test_strip_attribute ():
+    d = html5lib.parse ('<a b=1 c="yes" d></a><br b=2 c="no" d keep=1>')
+    stream = StripAttributeFilter (getTreeWalker ('etree')(d), ['b', 'c', 'd'])
+    serializer = HTMLSerializer ()
+    assert serializer.render (stream) == '<a></a><br keep=1>'
+
+@pytest.mark.asyncio
+async def test_treewalker (tab):
+    frames = await tab.Page.getFrameTree ()
+
+    framehtml = '<HTML><HEAD></HEAD><BODY></BODY></HTML>'
+    html = '<HTML><HEAD><META charset=utf-8></HEAD><BODY><H1>Hello</H1><!-- comment --><IFRAME></IFRAME></BODY></HTML>'
+    rootframe = frames['frameTree']['frame']['id']
+    await tab.Page.setDocumentContent (frameId=rootframe, html=html)
+
+    dom = await tab.DOM.getDocument (depth=-1, pierce=True)
+    docs = list (ChromeTreeWalker (dom['root']).split ())
+    assert len(docs) == 2
+    for i, doc in enumerate (docs):
+        walker = ChromeTreeWalker (doc)
+        serializer = HTMLSerializer ()
+        result = serializer.render (iter(walker))
+        if i == 0:
+            assert result == html
+        elif i == 1:
+            assert result == framehtml
+
+cdataDoc = '<test><![CDATA[Hello world]]></test>'
+xmlHeader = '<?xml version="1.0" encoding="UTF-8"?>'
+async def hello(request):
+    return web.Response(text=xmlHeader + cdataDoc, content_type='text/xml')
+
+@pytest.fixture
+async def server ():
+    """ Simple HTTP server for testing notifications """
+    app = web.Application()
+    app.add_routes([web.get('/test.xml', hello)])
+    runner = web.AppRunner(app)
+    await runner.setup()
+    site = web.TCPSite(runner, 'localhost', 8080)
+    await site.start()
+    yield app
+    await runner.cleanup ()
+
+@pytest.mark.asyncio
+async def test_treewalker_cdata (tab, server):
+    ret = await tab.Page.navigate (url='http://localhost:8080/test.xml')
+    # wait until loaded XXX: replace with idle check
+    await asyncio.sleep (0.5)
+    dom = await tab.DOM.getDocument (depth=-1, pierce=True)
+    docs = list (ChromeTreeWalker (dom['root']).split ())
+    assert len(docs) == 1
+    for i, doc in enumerate (docs):
+        walker = ChromeTreeWalker (doc)
+        serializer = HTMLSerializer ()
+        result = serializer.render (iter(walker))
+        # chrome will display a pretty-printed viewer *plus* the original
+        # source (stripped of its xml header)
+        assert cdataDoc in result
+
+