diff --git a/package.json b/package.json
index 908515f642..9a9daf5cda 100644
--- a/package.json
+++ b/package.json
@@ -69,6 +69,7 @@
     "stylelint": "10.0.1",
     "svgo": "1.2.2",
     "swagger-parser": "6.0.5",
+    "vnu-jar": "^19.6.7",
     "webpack-dev-server": "3.5.1"
   },
   "scripts": {
diff --git a/tools/documentation.vnufilter b/tools/documentation.vnufilter
new file mode 100644
index 0000000000..35ea67a778
--- /dev/null
+++ b/tools/documentation.vnufilter
@@ -0,0 +1,10 @@
+# Real errors that should be fixed.
+
+Bad value “” for attribute “id” on element “div”: Bad id: An ID must not be the empty string\.
+Duplicate ID “[^”]*”\.
+The first occurrence of ID “[^”]*” was here\.
+
+# Warnings that are probably less important.
+
+The “type” attribute is unnecessary for JavaScript resources\.
+Section lacks heading\. Consider using “h2”-“h6” elements to add identifying headings to all sections\.
diff --git a/tools/test-documentation b/tools/test-documentation
index 7d03ae210c..6cc8623c27 100755
--- a/tools/test-documentation
+++ b/tools/test-documentation
@@ -41,27 +41,35 @@ rm -rf _build
 # The crawler would take a very long time to finish and TravisCI would fail as a result.
 sphinx-build -j8 -b html -d _build/doctrees -D html_theme_options.collapse_navigation=True . _build/html
 
+err=0
+
+check() {
+    if "$@"; then
+        color_message 92 "Passed!"
+    else
+        color_message 91 "Failed!"
+        err=1
+    fi
+}
+
+color_message 94 "Validating HTML..."
+check java -jar ../node_modules/vnu-jar/build/dist/vnu.jar \
+    --filterfile ../tools/documentation.vnufilter \
+    --skip-non-html \
+    _build/html
+
 if [ -n "$skip_check_links" ]; then
     color_message 94 "Skipped testing links in documentation."
-    exit 0
+else
+    cd ../tools/documentation_crawler
+    if [ -n "$skip_external_links" ]; then
+        color_message 94 "Testing only internal links in documentation..."
+        check scrapy crawl_with_status documentation_crawler -a skip_external=set "${loglevel[@]}"
+        # calling crawl directly as parameter needs to be passed
+    else
+        color_message 94 "Testing links in documentation..."
+        check scrapy crawl_with_status documentation_crawler "${loglevel[@]}"
+    fi
 fi
 
-cd ../tools/documentation_crawler
-set +e
-if [ -n "$skip_external_links" ]; then
-    color_message 94 "Testing only internal links in documentation..."
-    scrapy crawl_with_status documentation_crawler -a skip_external=set "${loglevel[@]}"
-    # calling crawl directly as parameter needs to be passed
-else
-    color_message 94 "Testing links in documentation..."
-    scrapy crawl_with_status documentation_crawler "${loglevel[@]}"
-fi
-
-result=$?
-if [ "$result" -ne 0 ]; then
-    color_message 91 "Failed!"
-    exit 1
-else
-    color_message 92 "Passed!"
-    exit 0
-fi
+exit "$err"
diff --git a/version.py b/version.py
index eaaaa9784f..1fabb20521 100644
--- a/version.py
+++ b/version.py
@@ -21,4 +21,4 @@ LATEST_RELEASE_ANNOUNCEMENT = "https://blog.zulip.org/2019/03/01/zulip-2-0-relea
 # Typically, adding a dependency only requires a minor version bump, and
 # removing a dependency requires a major version bump.
 
-PROVISION_VERSION = '35.0'
+PROVISION_VERSION = '35.1'
diff --git a/yarn.lock b/yarn.lock
index 86b1795ad2..91cf98ea07 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -11220,6 +11220,11 @@ vm-browserify@0.0.4:
   dependencies:
     indexof "0.0.1"
 
+vnu-jar@^19.6.7:
+  version "19.6.7"
+  resolved "https://registry.yarnpkg.com/vnu-jar/-/vnu-jar-19.6.7.tgz#b93bf99c11b64b2405d298dae3f511debece7db9"
+  integrity sha512-uBI4pvolFIbhVQuYempGKsV86kNV5bCH1wVsHPbPCuEtAMk4IovdksO2bdPERUiPRGWgHmJ9A9O/N8FydP4JOg==
+
 void-elements@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/void-elements/-/void-elements-2.0.1.tgz#c066afb582bb1cb4128d60ea92392e94d5e9dbec"