diff --git a/docs/components/dialog.md b/docs/components/dialog.md
index a5102a1e..7d332113 100644
--- a/docs/components/dialog.md
+++ b/docs/components/dialog.md
@@ -159,10 +159,12 @@ By default, dialogs will close when the user clicks the close button, clicks the
 
 To keep the dialog open in such cases, you can cancel the `sl-request-close` event. When canceled, the dialog will remain open and pulse briefly to draw the user's attention to it.
 
+You can use `event.detail.source` to determine what triggered the request to close. This example prevents the dialog from closing when the overlay is clicked, but allows the close button or <kbd>Escape</kbd> to dismiss it.
+
 ```html preview
 <sl-dialog label="Dialog" class="dialog-deny-close">
-  This dialog will not close unless you use the button below.
-  <sl-button slot="footer" variant="primary">Save &amp; Close</sl-button>
+  This dialog will not close when you click on the overlay.
+  <sl-button slot="footer" variant="primary">Close</sl-button>
 </sl-dialog>
 
 <sl-button>Open Dialog</sl-button>
@@ -170,12 +172,17 @@ To keep the dialog open in such cases, you can cancel the `sl-request-close` eve
 <script>
   const dialog = document.querySelector('.dialog-deny-close');
   const openButton = dialog.nextElementSibling;
-  const saveButton = dialog.querySelector('sl-button[slot="footer"]');
+  const closeButton = dialog.querySelector('sl-button[slot="footer"]');
 
   openButton.addEventListener('click', () => dialog.show());
-  saveButton.addEventListener('click', () => dialog.hide());
+  closeButton.addEventListener('click', () => dialog.hide());
 
-  dialog.addEventListener('sl-request-close', event => event.preventDefault());
+  // Prevent the dialog from closing when the user clicks on the overlay
+  dialog.addEventListener('sl-request-close', event => {
+    if (event.detail.source === 'overlay') {
+      event.preventDefault();
+    }
+  });
 </script>
 ```
 
@@ -186,17 +193,24 @@ import { SlButton, SlDialog } from '@shoelace-style/shoelace/dist/react';
 const App = () => {
   const [open, setOpen] = useState(false);
 
+  // Prevent the dialog from closing when the user clicks on the overlay
+  function handleRequestClose(event) {
+    if (event.detail.source === 'overlay') {
+      event.preventDefault();
+    }
+  }
+
   return (
     <>
       <SlDialog
         label="Dialog"
         open={open}
-        onSlRequestClose={event => event.preventDefault()}
+        onSlRequestClose={handleRequestClose}
         onSlAfterHide={() => setOpen(false)}
       >
-        This dialog will not close unless you use the button below.
+        This dialog will not close when you click on the overlay.
         <SlButton slot="footer" variant="primary" onClick={() => setOpen(false)}>
-          Save &amp; Close
+          Close
         </SlButton>
       </SlDialog>
 
diff --git a/docs/components/drawer.md b/docs/components/drawer.md
index 8c02017d..fab6c3d4 100644
--- a/docs/components/drawer.md
+++ b/docs/components/drawer.md
@@ -346,10 +346,12 @@ By default, drawers will close when the user clicks the close button, clicks the
 
 To keep the drawer open in such cases, you can cancel the `sl-request-close` event. When canceled, the drawer will remain open and pulse briefly to draw the user's attention to it.
 
+You can use `event.detail.source` to determine what triggered the request to close. This example prevents the drawer from closing when the overlay is clicked, but allows the close button or <kbd>Escape</kbd> to dismiss it.
+
 ```html preview
 <sl-drawer label="Drawer" class="drawer-deny-close">
-  This drawer will not close unless you use the button below.
-  <sl-button slot="footer" variant="primary">Save &amp; Close</sl-button>
+  This drawer will not close when you click on the overlay.
+  <sl-button slot="footer" variant="primary">Close</sl-button>
 </sl-drawer>
 
 <sl-button>Open Drawer</sl-button>
@@ -362,7 +364,13 @@ To keep the drawer open in such cases, you can cancel the `sl-request-close` eve
   openButton.addEventListener('click', () => drawer.show());
   closeButton.addEventListener('click', () => drawer.hide());
 
-  drawer.addEventListener('sl-request-close', event => event.preventDefault());
+  // Prevent the drawer from closing when the user clicks on the overlay
+  drawer.addEventListener('sl-request-close', event => {
+    if (event.detail.source === 'overlay') {
+      event.preventDefault();
+    }
+  });
+
 </script>
 ```
 
@@ -373,15 +381,22 @@ import { SlButton, SlDrawer } from '@shoelace-style/shoelace/dist/react';
 const App = () => {
   const [open, setOpen] = useState(false);
 
+  // Prevent the drawer from closing when the user clicks on the overlay
+  function handleRequestClose(event) {
+    if (event.detail.source === 'overlay') {
+      event.preventDefault();
+    }
+  }
+
   return (
     <>
       <SlDrawer
         label="Drawer"
         open={open}
-        onSlRequestClose={event => event.preventDefault()}
+        onSlRequestClose={handleRequestClose}
         onSlAfterHide={() => setOpen(false)}
       >
-        This drawer will not close unless you use the button below.
+        This drawer will not close when you click on the overlay.
         <SlButton slot="footer" variant="primary" onClick={() => setOpen(false)}>
           Save &amp; Close
         </SlButton>
diff --git a/docs/resources/changelog.md b/docs/resources/changelog.md
index 50e52196..ddec02b3 100644
--- a/docs/resources/changelog.md
+++ b/docs/resources/changelog.md
@@ -11,6 +11,7 @@ _During the beta period, these restrictions may be relaxed in the event of a mis
 - 🚨 BREAKING: the `unit` property of `<sl-format-bytes>` has changed to `byte | bit` instead of `bytes | bits`
 - Added `display-label` part to `<sl-select>` [#650](https://github.com/shoelace-style/shoelace/issues/650)
 - Added `--spacing` CSS custom property to `<sl-divider>` [#664](https://github.com/shoelace-style/shoelace/pull/664)
+- Added `event.detail.source` to the `sl-request-close` event in `<sl-dialog>` and `<sl-drawer>`
 - Fixed a bug that caused `<sl-progress-ring>` to render the wrong size when `--track-width` was increased [#656](https://github.com/shoelace-style/shoelace/issues/656)
 - Fixed a bug that allowed `<sl-details>` to open and close when disabled using a screen reader [#658](https://github.com/shoelace-style/shoelace/issues/658)
 - Fixed a bug in the FormData event polyfill that threw an error in some environments [#666](https://github.com/shoelace-style/shoelace/issues/666)
diff --git a/src/components/dialog/dialog.ts b/src/components/dialog/dialog.ts
index f9e22154..67998dda 100644
--- a/src/components/dialog/dialog.ts
+++ b/src/components/dialog/dialog.ts
@@ -32,9 +32,10 @@ const hasPreventScroll = isPreventScrollSupported();
  * @event sl-after-hide - Emitted after the dialog closes and all animations are complete.
  * @event sl-initial-focus - Emitted when the dialog opens and the panel gains focus. Calling `event.preventDefault()`
  *   will prevent focus and allow you to set it on a different element in the dialog, such as an input or button.
- * @event sl-request-close - Emitted when the user attempts to close the dialog by clicking the close button, clicking the
- *   overlay, or pressing the escape key. Calling `event.preventDefault()` will prevent the dialog from closing. Avoid
- *   using this unless closing the dialog will result in destructive behavior such as data loss.
+ * @event {{ source: 'close-button' | 'keyboard' | 'overlay' }} sl-request-close - Emitted when the user attempts to
+ *   close the dialog by clicking the close button, clicking the overlay, or pressing escape. Calling
+ *   `event.preventDefault()` will keep the dialog open. Avoid using this unless closing the dialog will result in
+ *   destructive behavior such as data loss.
  *
  * @csspart base - The component's base wrapper.
  * @csspart overlay - The overlay.
@@ -123,8 +124,12 @@ export default class SlDialog extends LitElement {
     return waitForEvent(this, 'sl-after-hide');
   }
 
-  private requestClose() {
-    const slRequestClose = emit(this, 'sl-request-close', { cancelable: true });
+  private requestClose(source: 'close-button' | 'keyboard' | 'overlay') {
+    const slRequestClose = emit(this, 'sl-request-close', {
+      cancelable: true,
+      detail: { source }
+    });
+
     if (slRequestClose.defaultPrevented) {
       const animation = getAnimation(this, 'dialog.denyClose');
       animateTo(this.panel, animation.keyframes, animation.options);
@@ -137,7 +142,7 @@ export default class SlDialog extends LitElement {
   handleKeyDown(event: KeyboardEvent) {
     if (event.key === 'Escape') {
       event.stopPropagation();
-      this.requestClose();
+      this.requestClose('keyboard');
     }
   }
 
@@ -217,7 +222,7 @@ export default class SlDialog extends LitElement {
         })}
         @keydown=${this.handleKeyDown}
       >
-        <div part="overlay" class="dialog__overlay" @click=${this.requestClose} tabindex="-1"></div>
+        <div part="overlay" class="dialog__overlay" @click=${() => this.requestClose('overlay')} tabindex="-1"></div>
 
         <div
           part="panel"
@@ -241,7 +246,7 @@ export default class SlDialog extends LitElement {
                     name="x"
                     label=${this.localize.term('close')}
                     library="system"
-                    @click="${this.requestClose}"
+                    @click="${() => this.requestClose('close-button')}"
                   ></sl-icon-button>
                 </header>
               `
diff --git a/src/components/drawer/drawer.ts b/src/components/drawer/drawer.ts
index 5bf0cf0a..3319b70f 100644
--- a/src/components/drawer/drawer.ts
+++ b/src/components/drawer/drawer.ts
@@ -33,9 +33,10 @@ const hasPreventScroll = isPreventScrollSupported();
  * @event sl-after-hide - Emitted after the drawer closes and all animations are complete.
  * @event sl-initial-focus - Emitted when the drawer opens and the panel gains focus. Calling `event.preventDefault()` will
  *   prevent focus and allow you to set it on a different element in the drawer, such as an input or button.
- * @event sl-request-close - Emitted when the user attempts to close the drawer by clicking the close button, clicking the
- *   overlay, or pressing the escape key. Calling `event.preventDefault()` will prevent the drawer from closing. Avoid
- *   using this unless closing the drawer will result in destructive behavior such as data loss.
+ * @event {{ source: 'close-button' | 'keyboard' | 'overlay' }} sl-request-close - Emitted when the user attempts to
+ *   close the drawer by clicking the close button, clicking the overlay, or pressing escape. Calling
+ *   `event.preventDefault()` will keep the drawer open. Avoid using this unless closing the drawer will result in
+ *   destructive behavior such as data loss.
  *
  * @csspart base - The component's base wrapper.
  * @csspart overlay - The overlay.
@@ -140,8 +141,12 @@ export default class SlDrawer extends LitElement {
     return waitForEvent(this, 'sl-after-hide');
   }
 
-  private requestClose() {
-    const slRequestClose = emit(this, 'sl-request-close', { cancelable: true });
+  private requestClose(source: 'close-button' | 'keyboard' | 'overlay') {
+    const slRequestClose = emit(this, 'sl-request-close', {
+      cancelable: true,
+      detail: { source }
+    });
+
     if (slRequestClose.defaultPrevented) {
       const animation = getAnimation(this, 'drawer.denyClose');
       animateTo(this.panel, animation.keyframes, animation.options);
@@ -154,7 +159,7 @@ export default class SlDrawer extends LitElement {
   handleKeyDown(event: KeyboardEvent) {
     if (event.key === 'Escape') {
       event.stopPropagation();
-      this.requestClose();
+      this.requestClose('keyboard');
     }
   }
 
@@ -243,7 +248,7 @@ export default class SlDrawer extends LitElement {
         })}
         @keydown=${this.handleKeyDown}
       >
-        <div part="overlay" class="drawer__overlay" @click=${this.requestClose} tabindex="-1"></div>
+        <div part="overlay" class="drawer__overlay" @click=${() => this.requestClose('overlay')} tabindex="-1"></div>
 
         <div
           part="panel"
@@ -268,7 +273,7 @@ export default class SlDrawer extends LitElement {
                     name="x"
                     label=${this.localize.term('close')}
                     library="system"
-                    @click=${this.requestClose}
+                    @click=${() => this.requestClose('close-button')}
                   ></sl-icon-button>
                 </header>
               `