diff --git a/g3doc/README.md b/g3doc/README.md
index 7956fe739..22bfb15f7 100644
--- a/g3doc/README.md
+++ b/g3doc/README.md
@@ -117,9 +117,7 @@ for more information on filesystem bundles. `runsc` implements multiple commands
 that perform various functions such as starting, stopping, listing, and querying
 the status of containers.
 
-### Sentry
-
-<a name="sentry"></a> <!-- For deep linking. -->
+### Sentry {#sentry}
 
 The Sentry is the largest component of gVisor. It can be thought of as a
 application kernel. The Sentry implements all the kernel functionality needed by
@@ -136,9 +134,7 @@ calls it makes. For example, the Sentry is not able to open files directly; file
 system operations that extend beyond the sandbox (not internal `/proc` files,
 pipes, etc) are sent to the Gofer, described below.
 
-### Gofer
-
-<a name="gofer"></a> <!-- For deep linking. -->
+### Gofer {#gofer}
 
 The Gofer is a standard host process which is started with each container and
 communicates with the Sentry via the [9P protocol][9p] over a socket or shared
@@ -146,7 +142,7 @@ memory channel. The Sentry process is started in a restricted seccomp container
 without access to file system resources. The Gofer mediates all access to the
 these resources, providing an additional level of isolation.
 
-### Application
+### Application {#application}
 
 The application is a normal Linux binary provided to gVisor in an OCI runtime
 bundle. gVisor aims to provide an environment equivalent to Linux v4.4, so
diff --git a/images/jekyll/Dockerfile b/images/jekyll/Dockerfile
index 4860dd750..ba039ba15 100644
--- a/images/jekyll/Dockerfile
+++ b/images/jekyll/Dockerfile
@@ -10,4 +10,5 @@ RUN gem install \
         jekyll-relative-links:0.6.1 \
         jekyll-feed:0.13.0 \
         jekyll-sitemap:1.4.0
+COPY checks.rb /checks.rb
 CMD ["/usr/gem/gems/jekyll-4.0.0/exe/jekyll", "build", "-t", "-s", "/input", "-d", "/output"]
diff --git a/images/jekyll/checks.rb b/images/jekyll/checks.rb
new file mode 100644
index 000000000..fc7e6b5a8
--- /dev/null
+++ b/images/jekyll/checks.rb
@@ -0,0 +1,36 @@
+#!/usr/local/bin/ruby
+#
+# HTMLProofer checks for the gVisor website.
+#
+require 'html-proofer'
+
+# NoOpenerCheck checks to make sure links with target=_blank include the
+# rel=noopener attribute.
+class NoOpenerCheck < ::HTMLProofer::Check
+  def run
+    @html.css('a').each do |node|
+      link = create_element(node)
+      line = node.line
+
+      rel = link.respond_to?(:rel) ? link.rel.split(' ') : []
+
+      if link.respond_to?(:target) && link.target == "_blank" && !rel.include?("noopener")
+        return add_issue("You should set rel=noopener for links with target=_blank", line: line)
+      end
+    end
+  end
+end
+
+def main()
+  options = {
+    :check_html => true,
+    :check_favicon => true,
+    :disable_external => true,
+  }
+
+  HTMLProofer.check_directories(ARGV, options).run
+end
+
+if __FILE__ == $0
+  main
+end
diff --git a/tools/bazeldefs/defs.bzl b/tools/bazeldefs/defs.bzl
index 620c460de..3db8e13d0 100644
--- a/tools/bazeldefs/defs.bzl
+++ b/tools/bazeldefs/defs.bzl
@@ -32,6 +32,9 @@ rbe_platform = native.platform
 rbe_toolchain = native.toolchain
 vdso_linker_option = "-fuse-ld=gold "
 
+def short_path(path):
+    return path
+
 def proto_library(name, has_services = None, **kwargs):
     native.proto_library(
         name = name,
diff --git a/tools/defs.bzl b/tools/defs.bzl
index 40afcdb79..e35e29634 100644
--- a/tools/defs.bzl
+++ b/tools/defs.bzl
@@ -7,7 +7,7 @@ change for Google-internal and bazel-compatible rules.
 
 load("//tools/go_stateify:defs.bzl", "go_stateify")
 load("//tools/go_marshal:defs.bzl", "go_marshal", "marshal_deps", "marshal_test_deps")
-load("//tools/bazeldefs:defs.bzl", _build_test = "build_test", _cc_binary = "cc_binary", _cc_flags_supplier = "cc_flags_supplier", _cc_grpc_library = "cc_grpc_library", _cc_library = "cc_library", _cc_proto_library = "cc_proto_library", _cc_test = "cc_test", _cc_toolchain = "cc_toolchain", _default_installer = "default_installer", _default_net_util = "default_net_util", _gazelle = "gazelle", _gbenchmark = "gbenchmark", _go_binary = "go_binary", _go_embed_data = "go_embed_data", _go_grpc_and_proto_libraries = "go_grpc_and_proto_libraries", _go_library = "go_library", _go_path = "go_path", _go_proto_library = "go_proto_library", _go_test = "go_test", _grpcpp = "grpcpp", _gtest = "gtest", _loopback = "loopback", _pkg_deb = "pkg_deb", _pkg_tar = "pkg_tar", _proto_library = "proto_library", _py_binary = "py_binary", _py_library = "py_library", _py_requirement = "py_requirement", _py_test = "py_test", _rbe_platform = "rbe_platform", _rbe_toolchain = "rbe_toolchain", _select_arch = "select_arch", _select_system = "select_system", _vdso_linker_option = "vdso_linker_option")
+load("//tools/bazeldefs:defs.bzl", _build_test = "build_test", _cc_binary = "cc_binary", _cc_flags_supplier = "cc_flags_supplier", _cc_grpc_library = "cc_grpc_library", _cc_library = "cc_library", _cc_proto_library = "cc_proto_library", _cc_test = "cc_test", _cc_toolchain = "cc_toolchain", _default_installer = "default_installer", _default_net_util = "default_net_util", _gazelle = "gazelle", _gbenchmark = "gbenchmark", _go_binary = "go_binary", _go_embed_data = "go_embed_data", _go_grpc_and_proto_libraries = "go_grpc_and_proto_libraries", _go_library = "go_library", _go_path = "go_path", _go_proto_library = "go_proto_library", _go_test = "go_test", _grpcpp = "grpcpp", _gtest = "gtest", _loopback = "loopback", _pkg_deb = "pkg_deb", _pkg_tar = "pkg_tar", _proto_library = "proto_library", _py_binary = "py_binary", _py_library = "py_library", _py_requirement = "py_requirement", _py_test = "py_test", _rbe_platform = "rbe_platform", _rbe_toolchain = "rbe_toolchain", _select_arch = "select_arch", _select_system = "select_system", _short_path = "short_path", _vdso_linker_option = "vdso_linker_option")
 load("//tools/bazeldefs:platforms.bzl", _default_platform = "default_platform", _platforms = "platforms")
 load("//tools/bazeldefs:tags.bzl", "go_suffixes")
 load("//tools/nogo:defs.bzl", "nogo_test")
@@ -38,6 +38,7 @@ py_requirement = _py_requirement
 py_test = _py_test
 select_arch = _select_arch
 select_system = _select_system
+short_path = _short_path
 rbe_platform = _rbe_platform
 rbe_toolchain = _rbe_toolchain
 vdso_linker_option = _vdso_linker_option
diff --git a/website/BUILD b/website/BUILD
index 4488cb543..10e0299ae 100644
--- a/website/BUILD
+++ b/website/BUILD
@@ -55,9 +55,7 @@ genrule(
           "docker run -i --user $$(id -u):$$(id -g) " +
           "-v $$(readlink -m $$T/output/_site):/output " +
           "gvisor.dev/images/jekyll " +
-          "/usr/gem/bin/htmlproofer " +
-          "--disable-external " +
-          "--check-html " +
+          "ruby /checks.rb " +
           "/output && " +
           "cp $(location //website/cmd/server) $$T/output/server && " +
           "tar -zcf $@ -C $$T/output . && " +
diff --git a/website/_includes/footer.html b/website/_includes/footer.html
index 9cc8176f7..c1a373329 100644
--- a/website/_includes/footer.html
+++ b/website/_includes/footer.html
@@ -8,7 +8,7 @@
 <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.13.0/d3.min.js" integrity="sha256-hYXbQJK4qdJiAeDVjjQ9G0D6A0xLnDQ4eJI9dkm7Fpk=" crossorigin="anonymous"></script>
 
 {% if site.analytics %}
-<script type="application/javascript">
+<script>
 var doNotTrack = false;
 if (!doNotTrack) {
   window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date;
diff --git a/website/_includes/graph.html b/website/_includes/graph.html
index f3a999341..ba4cf9840 100644
--- a/website/_includes/graph.html
+++ b/website/_includes/graph.html
@@ -1,7 +1,7 @@
 {::nomarkdown}
 {% assign fn = include.id | remove: " " | remove: "-" | downcase %}
 <figure><a href="{{ include.url }}"><svg id="{{ include.id }}" width=500 height=200 onload="render_{{ fn }}()"><title>{{ include.title }}</title></svg></a></figure>
-<script type="text/javascript">
+<script>
 function render_{{ fn }}() {
 d3.csv("{{ include.url }}", function(d, i, columns) {
     return d; // Transformed below.
diff --git a/website/_includes/header-links.html b/website/_includes/header-links.html
index 467bb1e72..4232fdaa5 100644
--- a/website/_includes/header-links.html
+++ b/website/_includes/header-links.html
@@ -2,7 +2,7 @@
   <div class="container">
     <div class="navbar-brand">
       <a href="/">
-        <img src="/assets/logos/logo_solo_on_dark.svg" height="25px" class="d-inline-block align-top" style="margin-right: 10px;" alt="logo"/>
+        <img src="/assets/logos/logo_solo_on_dark.svg" height="25" class="d-inline-block align-top" style="margin-right: 10px;" alt="logo" />
         gVisor
       </a>
     </div>
diff --git a/website/_layouts/docs.html b/website/_layouts/docs.html
index 549305089..6bc5d87db 100644
--- a/website/_layouts/docs.html
+++ b/website/_layouts/docs.html
@@ -47,8 +47,8 @@ categories:
       <h1>{{ page.title }}</h1>
       {% if page.editpath %}
         <p>
-        <a href="https://github.com/google/gvisor/edit/master/{{page.editpath}}" target="_blank"><i class="fa fa-edit fa-fw"></i> Edit this page</a>
-        <a href="https://github.com/google/gvisor/issues/new?title={{page.title | url_encode}}" target="_blank"><i class="fab fa-github fa-fw"></i> Create issue</a>
+        <a href="https://github.com/google/gvisor/edit/master/{{page.editpath}}" target="_blank" rel="noopener"><i class="fa fa-edit fa-fw"></i> Edit this page</a>
+        <a href="https://github.com/google/gvisor/issues/new?title={{page.title | url_encode}}" target="_blank" rel="noopener"><i class="fab fa-github fa-fw"></i> Create issue</a>
         </p>
       {% endif %}
       <div class="docs-content">
diff --git a/website/blog/2019-11-18-security-basics.md b/website/blog/2019-11-18-security-basics.md
index fbdd511dd..76bbabc13 100644
--- a/website/blog/2019-11-18-security-basics.md
+++ b/website/blog/2019-11-18-security-basics.md
@@ -44,10 +44,10 @@ into it in the next section!
 
 # Design Principles
 
-gVisor was designed with some
-[common secure design principles](https://www.owasp.org/index.php/Security_by_Design_Principles)
-in mind: Defense-in-Depth, Principle of Least-Privilege, Attack Surface
-Reduction and Secure-by-Default[^1].
+gVisor was designed with some common
+[secure design](https://en.wikipedia.org/wiki/Secure_by_design) principles in
+mind: Defense-in-Depth, Principle of Least-Privilege, Attack Surface Reduction
+and Secure-by-Default[^1].
 
 In general, Design Principles outline good engineering practices, but in the
 case of security, they also can be thought of as a set of tactics. In a
@@ -282,16 +282,23 @@ stable.
 
 ## Notes
 
-[^1]: [https://www.owasp.org/index.php/Security_by_Design_Principles](https://www.owasp.org/index.php/Security_by_Design_Principles)
+[^1]: [https://en.wikipedia.org/wiki/Secure_by_design](https://en.wikipedia.org/wiki/Secure_by_design)
 [^2]: [https://gvisor.dev/docs/architecture_guide](https://gvisor.dev/docs/architecture_guide/)
 [^3]: [https://github.com/google/gvisor/blob/master/pkg/sentry/syscalls/linux/linux64_amd64.go](https://github.com/google/gvisor/blob/master/pkg/sentry/syscalls/syscalls.go)
-[^4]: Internally that is, it doesn't call to the Host OS to implement them, in
-    fact that is explicitly disallowed, more on that in the future.
+
+<!-- mdformat off(mdformat formats this into multiple lines) -->
+[^4]: Internally that is, it doesn't call to the Host OS to implement them, in fact that is explicitly disallowed, more on that in the future.
+<!-- mdformat on -->
+
 [^5]: [https://elixir.bootlin.com/linux/latest/source/arch/x86/entry/syscalls/syscall_64.tbl#L345](https://elixir.bootlin.com/linux/latest/source/arch/x86/entry/syscalls/syscall_64.tbl#L345)
 [^6]: [https://github.com/google/gvisor/tree/master/runsc/boot/filter](https://github.com/google/gvisor/tree/master/runsc/boot/filter)
 [^7]: [https://en.wikipedia.org/wiki/Dirty_COW](https://en.wikipedia.org/wiki/Dirty_COW)
 [^8]: [https://github.com/google/gvisor/blob/master/runsc/boot/config.go](https://github.com/google/gvisor/blob/master/runsc/boot/config.go)
-[^9]: [https://en.wikipedia.org/wiki/9P_(protocol)](https://en.wikipedia.org/wiki/9P_\(protocol\))
+
+<!-- mdformat off(mdformat breaks this url by escaping the parenthesis) -->
+[^9]: [https://en.wikipedia.org/wiki/9P_(protocol)](https://en.wikipedia.org/wiki/9P_(protocol))
+<!-- mdformat on -->
+
 [^10]: [https://gvisor.dev/docs/user_guide/networking/#network-passthrough](https://gvisor.dev/docs/user_guide/networking/#network-passthrough)
 [^11]: [https://github.com/google/gvisor/blob/c7e901f47a09eaac56bd4813227edff016fa6bff/pkg/sentry/platform/ptrace/subprocess.go#L390](https://github.com/google/gvisor/blob/c7e901f47a09eaac56bd4813227edff016fa6bff/pkg/sentry/platform/ptrace/subprocess.go#L390)
 [^12]: [https://github.com/google/gvisor/blob/c7e901f47a09eaac56bd4813227edff016fa6bff/pkg/sentry/platform/ring0/kernel_amd64.go#L182](https://github.com/google/gvisor/blob/c7e901f47a09eaac56bd4813227edff016fa6bff/pkg/sentry/platform/ring0/kernel_amd64.go#L182)
diff --git a/website/defs.bzl b/website/defs.bzl
index ead6a3067..f52946c15 100644
--- a/website/defs.bzl
+++ b/website/defs.bzl
@@ -1,5 +1,7 @@
 """Wrappers for website documentation."""
 
+load("//tools:defs.bzl", "short_path")
+
 # DocInfo is a provider which simple adds sufficient metadata to the source
 # files (and additional data files) so that a jeyll header can be constructed
 # dynamically. This is done the via BUILD system so that the plain
@@ -29,7 +31,7 @@ def _doc_impl(ctx):
             category = ctx.attr.category,
             subcategory = ctx.attr.subcategory,
             weight = ctx.attr.weight,
-            editpath = ctx.files.src[0].short_path,
+            editpath = short_path(ctx.files.src[0].short_path),
             authors = ctx.attr.authors,
         ),
     ]