diff --git a/lib/html.js b/lib/html.js
index 3c3bede..c14271c 100644
--- a/lib/html.js
+++ b/lib/html.js
@@ -117,6 +117,7 @@ export const html = create({
     onAuxClick: null,
     onBeforeMatch: null,
     onBeforePrint: null,
+    onBeforeToggle: null,
     onBeforeUnload: null,
     onBlur: null,
     onCancel: null,
@@ -222,6 +223,8 @@ export const html = create({
     scoped: boolean,
     seamless: boolean,
     selected: boolean,
+    shadowRootDelegatesFocus: boolean,
+    shadowRootMode: null,
     shape: null,
     size: number,
     sizes: null,
diff --git a/readme.md b/readme.md
index 11e6947..3e0ba04 100644
--- a/readme.md
+++ b/readme.md
@@ -599,6 +599,7 @@ It also works in Deno and modern browsers.
 | `onAuxClick`                 | `onauxclick`                   | `html`        |
 | `onBeforeMatch`              | `onbeforematch`                | `html`        |
 | `onBeforePrint`              | `onbeforeprint`                | `svg`, `html` |
+| `onBeforeToggle`             | `onbeforetoggle`               | `html`        |
 | `onBeforeUnload`             | `onbeforeunload`               | `html`        |
 | `onBegin`                    | `onbegin`                      | `svg`         |
 | `onBlur`                     | `onblur`                       | `html`        |
@@ -772,6 +773,8 @@ It also works in Deno and modern browsers.
 | `security`                   | `security`                     | `html`        |
 | `seed`                       | `seed`                         | `svg`         |
 | `selected`                   | `selected`                     | `html`        |
+| `shadowRootDelegatesFocus`   | `shadowrootdelegatesfocus`     | `html`        |
+| `shadowRootMode`             | `shadowrootmode`               | `html`        |
 | `shape`                      | `shape`                        | `html`        |
 | `shapeRendering`             | `shape-rendering`              | `svg`         |
 | `side`                       | `side`                         | `svg`         |