diff --git a/.github/workflows/pr-push.yml b/.github/workflows/pr-push.yml
index a647524..8aa097d 100644
--- a/.github/workflows/pr-push.yml
+++ b/.github/workflows/pr-push.yml
@@ -9,6 +9,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+      - name: Generate safe-default-configuration.json
+        run: python builtins/safe-default-configuration.py --input builtins/safe-default-configuration.txt --out builtins/safe-default-configuration.json
+      - name: Generate safe-baseline-configuration-materialized.json
+        run: python builtins/safe-baseline-configuration.py --input builtins/safe-baseline-configuration.json --event-handlers builtins/event-handler-content-attributes.txt --out builtins/safe-baseline-configuration-materialized.json
       - uses: w3c/spec-prod@v2
         with:
           GH_PAGES_BRANCH: gh-pages
diff --git a/.gitignore b/.gitignore
index 5a11222..c46a6e3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 /.project
 /out
 /*.ninja*
+/builtins/safe-default-configuration.json
+/builtins/safe-baseline-configuration-materialized.json
diff --git a/builtins/event-handler-content-attributes.txt b/builtins/event-handler-content-attributes.txt
new file mode 100644
index 0000000..af71ef7
--- /dev/null
+++ b/builtins/event-handler-content-attributes.txt
@@ -0,0 +1,89 @@
+// https://html.spec.whatwg.org/#ix-event-handlers
+onafterprint
+onauxclick
+onbeforeinput
+onbeforematch
+onbeforeprint
+onbeforeunload
+onbeforetoggle
+onblur
+oncancel
+oncanplay
+oncanplaythrough
+onchange
+onclick
+onclose
+oncontextlost
+oncontextmenu
+oncontextrestored
+oncopy
+oncuechange
+oncut
+ondblclick
+ondrag
+ondragend
+ondragenter
+ondragleave
+ondragover
+ondragstart
+ondrop
+ondurationchange
+onemptied
+onended
+onerror
+onfocus
+onformdata
+onhashchange
+oninput
+oninvalid
+onkeydown
+onkeypress
+onkeyup
+onlanguagechange
+onload
+onloadeddata
+onloadedmetadata
+onloadstart
+onmessage
+onmessageerror
+onmousedown
+onmouseenter
+onmouseleave
+onmousemove
+onmouseout
+onmouseover
+onmouseup
+onoffline
+ononline
+onpagehide
+onpagereveal
+onpageshow
+onpageswap
+onpaste
+onpause
+onplay
+onplaying
+onpopstate
+onprogress
+onratechange
+onreset
+onresize
+onrejectionhandled
+onscroll
+onscrollend
+onsecuritypolicyviolation
+onseeked
+onseeking
+onselect
+onslotchange
+onstalled
+onstorage
+onsubmit
+onsuspend
+ontimeupdate
+ontoggle
+onunhandledrejection
+onunload
+onvolumechange
+onwaiting
+onwheel
diff --git a/builtins/safe-baseline-configuration-materialized.json b/builtins/safe-baseline-configuration-materialized.json
new file mode 100644
index 0000000..e69de29
diff --git a/builtins/safe-baseline-configuration.json b/builtins/safe-baseline-configuration.json
new file mode 100644
index 0000000..2f6c8c1
--- /dev/null
+++ b/builtins/safe-baseline-configuration.json
@@ -0,0 +1,33 @@
+{
+  "removeElements": [
+    {
+      "namespace": "http://www.w3.org/1999/xhtml",
+      "name": "script"
+    },
+    {
+      "namespace": "http://www.w3.org/1999/xhtml",
+      "name": "frame"
+    },
+    {
+      "namespace": "http://www.w3.org/1999/xhtml",
+      "name": "iframe"
+    },
+    {
+      "namespace": "http://www.w3.org/1999/xhtml",
+      "name": "object"
+    },
+    {
+      "namespace": "http://www.w3.org/1999/xhtml",
+      "name": "embed"
+    },
+    {
+      "namespace": "http://www.w3.org/2000/svg",
+      "name": "script"
+    },
+    {
+      "namespace": "http://www.w3.org/2000/svg",
+      "name": "use"
+    }
+  ],
+  "removeAttributes": []
+}
diff --git a/builtins/safe-baseline-configuration.py b/builtins/safe-baseline-configuration.py
new file mode 100644
index 0000000..452ecc4
--- /dev/null
+++ b/builtins/safe-baseline-configuration.py
@@ -0,0 +1,39 @@
+# Sanitizer API - Build configuration dictionary from text file.
+
+import json
+import argparse
+import sys
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--input", type=argparse.FileType('r'), required=True)
+    parser.add_argument("--event-handlers", type=argparse.FileType('r'),
+                        required=True)
+    parser.add_argument("--out", type=argparse.FileType('w'), required=True)
+    args = parser.parse_args()
+
+    try:
+      config = json.load(args.input)
+    except BaseException as err:
+      parser.error("Cannot read from --input file.")
+
+    try:
+      events = args.event_handlers.read()
+    except BaseException as err:
+      parser.error("Cannot read from --event-handlers file.")
+
+    for event in events.split("\n"):
+      if not event:
+        continue
+      if event.startswith("//"):
+        continue
+      config["removeAttributes"].append(event)
+
+    try:
+      json.dump(config, args.out, indent=2)
+    except BaseException as err:
+      parser.error("Cannot write to --out file.")
+    return 0
+
+if __name__ == "__main__":
+    main()
diff --git a/builtins/safe-default-configuration.json b/builtins/safe-default-configuration.json
new file mode 100644
index 0000000..e69de29
diff --git a/builtins/safe-default-configuration.py b/builtins/safe-default-configuration.py
new file mode 100644
index 0000000..61996fd
--- /dev/null
+++ b/builtins/safe-default-configuration.py
@@ -0,0 +1,42 @@
+# Sanitizer API - Build configuration dictionary from text file.
+
+import json
+import argparse
+import sys
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--input", type=argparse.FileType('r'), required=True)
+    parser.add_argument("--out", type=argparse.FileType('w'), required=True)
+    args = parser.parse_args()
+
+    try:
+      lines = args.input.read()
+    except BaseException as err:
+      parser.error("Cannot read from --input file.")
+
+    result = { "elements": [], "attributes": [] }
+    current = []
+    for line in lines.split("\n"):
+      if not line:
+        pass
+      elif line.startswith("//"):
+        pass
+      elif line.startswith("- "):
+        current.append({ "name": line[2:], "namespace": None })
+      elif line == "[HTML Global]":
+        current = result["attributes"]
+      else:
+        elem = { "name": line, "namespace": "http://www.w3.org/1999/xhtml",
+                 "attributes": [] }
+        result["elements"].append(elem)
+        current = elem["attributes"]
+
+    try:
+      json.dump(result, args.out, indent=2)
+    except BaseException as err:
+      parser.error("Cannot write to --out file.")
+    return 0
+
+if __name__ == "__main__":
+    main()
diff --git a/builtins/safe-default-configuration.txt b/builtins/safe-default-configuration.txt
new file mode 100644
index 0000000..7c8850b
--- /dev/null
+++ b/builtins/safe-default-configuration.txt
@@ -0,0 +1,171 @@
+// Document element
+// https://html.spec.whatwg.org/#the-root-element
+
+html
+
+// Document metadata
+// https://html.spec.whatwg.org/#document-metadata
+
+head
+title
+
+// meta and link, purposely omitted
+
+// Sections
+// https://html.spec.whatwg.org/#sections
+
+body
+article
+section
+nav
+aside
+h1
+h2
+h3
+h4
+h5
+h6
+hgroup
+header
+footer
+address
+
+// Grouping Content
+// https://html.spec.whatwg.org/#grouping-content
+
+p
+hr
+pre
+blockquote
+- cite
+ol
+- reversed
+- start
+- type
+ul
+menu
+li
+- value
+dl
+dt
+dd
+figure
+figcaption
+main
+search
+div
+
+// Text-level Semantics
+// https://html.spec.whatwg.org/#text-level-semantics ###
+
+a
+- href
+- rel
+- hreflang
+- type
+// Purposely omitted:
+// - target
+// - download
+// - referrerpolicy
+// - ping
+em
+strong
+small
+s
+cite
+q
+dfn
+- title
+abbr
+- title
+ruby
+rt
+rp
+data
+- value
+time
+- datetime
+code
+var
+samp
+kbd
+sub
+sup
+i
+b
+u
+mark
+bdi
+- dir
+bdo
+- dir
+span
+br
+wbr
+
+// Edits
+// https://html.spec.whatwg.org/#edits
+
+ins
+- cite
+- datetime
+del
+- cite
+- datetime
+
+// Embedded content
+// https://html.spec.whatwg.org/#embedded-content
+//
+// Purposely omitted.
+
+// Tabular Data
+// https://html.spec.whatwg.org/#tables
+
+table
+caption
+colgroup
+- span
+col
+- span
+tbody
+thead
+tfoot
+tr
+td
+- colspan
+- rowspan
+- headers
+th
+- colspan
+- rowspan
+- headers
+- scope
+- abbr
+
+// Forms
+// https://html.spec.whatwg.org/#forms
+//
+// Purposely omitted
+
+// Interactive Elements
+// https://html.spec.whatwg.org/#interactive-elements
+//
+// Purposly omitted.
+
+// Scripting
+// https://html.spec.whatwg.org/#scripting
+//
+// Purposely omitted.
+
+// SVG: TBD
+// MathML: TDB
+
+// HTML global attributes
+//
+// Selection of attributes. Most are purposely omitted.
+
+[HTML Global]
+- dir
+- lang
+- title
+
diff --git a/index.bs b/index.bs
index e758d55..ca31e34 100644
--- a/index.bs
+++ b/index.bs
@@ -22,6 +22,7 @@ Markup Shorthands: css off, markdown on
 spec:html; type:attribute; text: innerHTML
 spec:dom; type:method; text: createDocumentFragment
 spec:html; type:dfn; text: template contents
+spec:infra; type:dfn; text: user agent
 </pre>
 <pre class="anchors">
 text: window.toStaticHTML(); type: method; url: https://msdn.microsoft.com/en-us/library/cc848922(v=vs.85).aspx
@@ -576,6 +577,8 @@ To <dfn for="SanitizerConfig">remove unsafe</dfn> from a |configuration|, do thi
 1. [=list/For each=] |attribute| in
    [=built-in safe baseline configuration=][{{SanitizerConfig/removeAttributes}}]:
     1. Call [=Sanitizer/remove an attribute=] with |attribute| and |result|.
+1. [=list/For each=] |attribute| listed in [=event handler content attributes=]:
+    1. Call [=Sanitizer/remove an attribute=] with |attribute| and |result|.
 1. Return |result|.
 
 </div>
@@ -709,7 +712,7 @@ regard to order:
 [=superset=] of |B| and |B| is a [=superset=] of |A|.
 </div>
 
-## Defaults ## {#sanitization-defaults}
+## Builtins ## {#sanitization-defaults}
 
 There are three builtins:
 
@@ -718,24 +721,37 @@ There are three builtins:
 * the [=built-in navigating URL attributes list=].
 
 The <dfn>built-in safe default configuration</dfn> is as follows:
-```
-{
-  elements: [ ... ],
-  attributes: [ ... ],
-}
-```
+
+<pre class="include-code">
+path: builtins/safe-default-configuration.json
+highlight: json
+</pre>
 
 The <dfn>built-in safe baseline configuration</dfn> is meant to block only
-script-content, and nothing else. It is as follows:
-```
-{
-  removeElements: [
-    { name: "script", namespace: "http://www.w3.org/1999/xhtml" },
-    { name: "script", namespace: "http://www.w3.org/2000/svg" }
-  ],
-  removeAttributes: [....],
-}
-```
+script-content. It is as follows:
+
+<pre class="include-code">
+path: builtins/safe-baseline-configuration.json
+highlight: json
+</pre>
+
+<div class="advisement">
+<!-- When included in HTML, this should probably read as class="warning". -->
+
+<strong class="marker">Warning:</strong> The [=remove unsafe=] algorithm specifies
+to additionally remove any [=event handler content attributes=], as defined
+in [[HTML]].
+If a [=user agent=] defines extensions to the [[HTML]] spec with additional
+[=event handler content attributes=], it is its responsibility to decide how
+to handle them. Using the current [=event handler content attributes=] list,
+the safe baseline configuration looks effectively like so:
+
+<pre class="include-code">
+path: builtins/safe-baseline-configuration-materialized.json
+highlight: json
+</pre>
+
+</div>
 
 <div>
 The <dfn>built-in navigating URL attributes list</dfn>, for which "`javascript:`"
diff --git a/resources/baseline-attribute-allow-list.json b/resources/baseline-attribute-allow-list.json
deleted file mode 100644
index 1b7bee6..0000000
--- a/resources/baseline-attribute-allow-list.json
+++ /dev/null
@@ -1,213 +0,0 @@
-[
-  "abbr",
-  "accept",
-  "accept-charset",
-  "accesskey",
-  "action",
-  "align",
-  "alink",
-  "allow",
-  "allowfullscreen",
-  "allowpaymentrequest",
-  "alt",
-  "anchor",
-  "archive",
-  "as",
-  "async",
-  "autocapitalize",
-  "autocomplete",
-  "autocorrect",
-  "autofocus",
-  "autopictureinpicture",
-  "autoplay",
-  "axis",
-  "background",
-  "behavior",
-  "bgcolor",
-  "border",
-  "bordercolor",
-  "capture",
-  "cellpadding",
-  "cellspacing",
-  "challenge",
-  "char",
-  "charoff",
-  "charset",
-  "checked",
-  "cite",
-  "class",
-  "classid",
-  "clear",
-  "code",
-  "codebase",
-  "codetype",
-  "color",
-  "cols",
-  "colspan",
-  "compact",
-  "content",
-  "contenteditable",
-  "controls",
-  "controlslist",
-  "conversiondestination",
-  "coords",
-  "crossorigin",
-  "csp",
-  "data",
-  "datetime",
-  "declare",
-  "decoding",
-  "default",
-  "defer",
-  "dir",
-  "direction",
-  "dirname",
-  "disabled",
-  "disablepictureinpicture",
-  "disableremoteplayback",
-  "disallowdocumentaccess",
-  "download",
-  "draggable",
-  "elementtiming",
-  "enctype",
-  "end",
-  "enterkeyhint",
-  "event",
-  "exportparts",
-  "face",
-  "for",
-  "form",
-  "formaction",
-  "formenctype",
-  "formmethod",
-  "formnovalidate",
-  "formtarget",
-  "frame",
-  "frameborder",
-  "headers",
-  "height",
-  "hidden",
-  "high",
-  "href",
-  "hreflang",
-  "hreftranslate",
-  "hspace",
-  "http-equiv",
-  "id",
-  "imagesizes",
-  "imagesrcset",
-  "importance",
-  "impressiondata",
-  "impressionexpiry",
-  "incremental",
-  "inert",
-  "inputmode",
-  "integrity",
-  "invisible",
-  "is",
-  "ismap",
-  "keytype",
-  "kind",
-  "label",
-  "lang",
-  "language",
-  "latencyhint",
-  "leftmargin",
-  "link",
-  "list",
-  "loading",
-  "longdesc",
-  "loop",
-  "low",
-  "lowsrc",
-  "manifest",
-  "marginheight",
-  "marginwidth",
-  "max",
-  "maxlength",
-  "mayscript",
-  "media",
-  "method",
-  "min",
-  "minlength",
-  "multiple",
-  "muted",
-  "name",
-  "nohref",
-  "nomodule",
-  "nonce",
-  "noresize",
-  "noshade",
-  "novalidate",
-  "nowrap",
-  "object",
-  "open",
-  "optimum",
-  "part",
-  "pattern",
-  "ping",
-  "placeholder",
-  "playsinline",
-  "policy",
-  "poster",
-  "preload",
-  "pseudo",
-  "readonly",
-  "referrerpolicy",
-  "rel",
-  "reportingorigin",
-  "required",
-  "resources",
-  "rev",
-  "reversed",
-  "role",
-  "rows",
-  "rowspan",
-  "rules",
-  "sandbox",
-  "scheme",
-  "scope",
-  "scopes",
-  "scrollamount",
-  "scrolldelay",
-  "scrolling",
-  "select",
-  "selected",
-  "shadowroot",
-  "shadowrootdelegatesfocus",
-  "shape",
-  "size",
-  "sizes",
-  "slot",
-  "span",
-  "spellcheck",
-  "src",
-  "srcdoc",
-  "srclang",
-  "srcset",
-  "standby",
-  "start",
-  "step",
-  "style",
-  "summary",
-  "tabindex",
-  "target",
-  "text",
-  "title",
-  "topmargin",
-  "translate",
-  "truespeed",
-  "trusttoken",
-  "type",
-  "usemap",
-  "valign",
-  "value",
-  "valuetype",
-  "version",
-  "virtualkeyboardpolicy",
-  "vlink",
-  "vspace",
-  "webkitdirectory",
-  "width",
-  "wrap"
-]
diff --git a/resources/baseline-element-allow-list.json b/resources/baseline-element-allow-list.json
deleted file mode 100644
index cf470cd..0000000
--- a/resources/baseline-element-allow-list.json
+++ /dev/null
@@ -1,130 +0,0 @@
-[
-  "a",
-  "abbr",
-  "acronym",
-  "address",
-  "area",
-  "article",
-  "aside",
-  "audio",
-  "b",
-  "basefont",
-  "bdi",
-  "bdo",
-  "bgsound",
-  "big",
-  "blockquote",
-  "body",
-  "br",
-  "button",
-  "canvas",
-  "caption",
-  "center",
-  "cite",
-  "code",
-  "col",
-  "colgroup",
-  "command",
-  "data",
-  "datalist",
-  "dd",
-  "del",
-  "details",
-  "dfn",
-  "dialog",
-  "dir",
-  "div",
-  "dl",
-  "dt",
-  "em",
-  "fieldset",
-  "figcaption",
-  "figure",
-  "font",
-  "footer",
-  "form",
-  "h1",
-  "h2",
-  "h3",
-  "h4",
-  "h5",
-  "h6",
-  "head",
-  "header",
-  "hgroup",
-  "hr",
-  "html",
-  "i",
-  "image",
-  "img",
-  "input",
-  "ins",
-  "kbd",
-  "keygen",
-  "label",
-  "layer",
-  "legend",
-  "li",
-  "link",
-  "listing",
-  "main",
-  "map",
-  "mark",
-  "marquee",
-  "menu",
-  "meta",
-  "meter",
-  "nav",
-  "nobr",
-  "ol",
-  "optgroup",
-  "option",
-  "output",
-  "p",
-  "picture",
-  "plaintext",
-  "popup",
-  "portal",
-  "pre",
-  "progress",
-  "q",
-  "rb",
-  "rp",
-  "rt",
-  "rtc",
-  "ruby",
-  "s",
-  "samp",
-  "section",
-  "select",
-  "selectmenu",
-  "slot",
-  "small",
-  "source",
-  "span",
-  "strike",
-  "strong",
-  "style",
-  "sub",
-  "summary",
-  "sup",
-  "table",
-  "tbody",
-  "td",
-  "template",
-  "textarea",
-  "tfoot",
-  "th",
-  "thead",
-  "time",
-  "title",
-  "tr",
-  "track",
-  "tt",
-  "u",
-  "ul",
-  "var",
-  "video",
-  "wbr",
-  "xmp"
-]
diff --git a/resources/default-configuration.json b/resources/default-configuration.json
deleted file mode 100644
index f6613ae..0000000
--- a/resources/default-configuration.json
+++ /dev/null
@@ -1,755 +0,0 @@
-{
-  "allowCustomElements": false,
-  "allowUnknownMarkup": false,
-  "allowElements": [
-    "a",
-    "abbr",
-    "acronym",
-    "address",
-    "area",
-    "article",
-    "aside",
-    "audio",
-    "b",
-    "bdi",
-    "bdo",
-    "bgsound",
-    "big",
-    "blockquote",
-    "body",
-    "br",
-    "button",
-    "canvas",
-    "caption",
-    "center",
-    "cite",
-    "code",
-    "col",
-    "colgroup",
-    "datalist",
-    "dd",
-    "del",
-    "details",
-    "dfn",
-    "dialog",
-    "dir",
-    "div",
-    "dl",
-    "dt",
-    "em",
-    "fieldset",
-    "figcaption",
-    "figure",
-    "font",
-    "footer",
-    "form",
-    "h1",
-    "h2",
-    "h3",
-    "h4",
-    "h5",
-    "h6",
-    "head",
-    "header",
-    "hgroup",
-    "hr",
-    "html",
-    "i",
-    "img",
-    "input",
-    "ins",
-    "kbd",
-    "keygen",
-    "label",
-    "layer",
-    "legend",
-    "li",
-    "link",
-    "listing",
-    "main",
-    "map",
-    "mark",
-    "marquee",
-    "menu",
-    "meta",
-    "meter",
-    "nav",
-    "nobr",
-    "ol",
-    "optgroup",
-    "option",
-    "output",
-    "p",
-    "picture",
-    "popup",
-    "pre",
-    "progress",
-    "q",
-    "rb",
-    "rp",
-    "rt",
-    "rtc",
-    "ruby",
-    "s",
-    "samp",
-    "section",
-    "select",
-    "selectmenu",
-    "small",
-    "source",
-    "span",
-    "strike",
-    "strong",
-    "style",
-    "sub",
-    "summary",
-    "sup",
-    "table",
-    "tbody",
-    "td",
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