Blazor drag-'n-drop guidance (#19960)

Author: guardrex

aspnetcore/blazor/components/event-handling.md

@@ -78,7 +78,7 @@ Supported <xref:System.EventArgs> are shown in the following table.
 | Event            | Class  | DOM events and notes |
 | ---------------- | ------ | -------------------- |
 | Clipboard        | <xref:Microsoft.AspNetCore.Components.Web.ClipboardEventArgs> | `oncut`, `oncopy`, `onpaste` |
-| Drag             | <xref:Microsoft.AspNetCore.Components.Web.DragEventArgs> | `ondrag`, `ondragstart`, `ondragenter`, `ondragleave`, `ondragover`, `ondrop`, `ondragend`<br><br><xref:Microsoft.AspNetCore.Components.Web.DataTransfer> and <xref:Microsoft.AspNetCore.Components.Web.DataTransferItem> hold dragged item data. |
+| Drag             | <xref:Microsoft.AspNetCore.Components.Web.DragEventArgs> | `ondrag`, `ondragstart`, `ondragenter`, `ondragleave`, `ondragover`, `ondrop`, `ondragend`<br><br><xref:Microsoft.AspNetCore.Components.Web.DataTransfer> and <xref:Microsoft.AspNetCore.Components.Web.DataTransferItem> hold dragged item data.<br><br>Implement drag and drop in Blazor apps using [JS interop](xref:blazor/call-javascript-from-dotnet) with [HTML Drag and Drop API](https://developer.mozilla.org/docs/Web/API/HTML_Drag_and_Drop_API). |
 | Error            | <xref:Microsoft.AspNetCore.Components.Web.ErrorEventArgs> | `onerror` |
 | Event            | <xref:System.EventArgs> | *General*<br>`onactivate`, `onbeforeactivate`, `onbeforedeactivate`, `ondeactivate`, `onfullscreenchange`, `onfullscreenerror`, `onloadeddata`, `onloadedmetadata`, `onpointerlockchange`, `onpointerlockerror`, `onreadystatechange`, `onscroll`<br><br>*Clipboard*<br>`onbeforecut`, `onbeforecopy`, `onbeforepaste`<br><br>*Input*<br>`oninvalid`, `onreset`, `onselect`, `onselectionchange`, `onselectstart`, `onsubmit`<br><br>*Media*<br>`oncanplay`, `oncanplaythrough`, `oncuechange`, `ondurationchange`, `onemptied`, `onended`, `onpause`, `onplay`, `onplaying`, `onratechange`, `onseeked`, `onseeking`, `onstalled`, `onstop`, `onsuspend`, `ontimeupdate`, `ontoggle`, `onvolumechange`, `onwaiting`<br><br><xref:Microsoft.AspNetCore.Components.Web.EventHandlers> holds attributes to configure the mappings between event names and event argument types. |
 | Focus            | <xref:Microsoft.AspNetCore.Components.Web.FocusEventArgs> | `onfocus`, `onblur`, `onfocusin`, `onfocusout`<br><br>Doesn't include support for `relatedTarget`. |
@@ -97,7 +97,7 @@ Supported <xref:System.EventArgs> are shown in the following table.
 | Event            | Class | DOM events and notes |
 | ---------------- | ----- | -------------------- |
 | Clipboard        | <xref:Microsoft.AspNetCore.Components.Web.ClipboardEventArgs> | `oncut`, `oncopy`, `onpaste` |
-| Drag             | <xref:Microsoft.AspNetCore.Components.Web.DragEventArgs> | `ondrag`, `ondragstart`, `ondragenter`, `ondragleave`, `ondragover`, `ondrop`, `ondragend`<br><br><xref:Microsoft.AspNetCore.Components.Web.DataTransfer> and <xref:Microsoft.AspNetCore.Components.Web.DataTransferItem> hold dragged item data. |
+| Drag             | <xref:Microsoft.AspNetCore.Components.Web.DragEventArgs> | `ondrag`, `ondragstart`, `ondragenter`, `ondragleave`, `ondragover`, `ondrop`, `ondragend`<br><br><xref:Microsoft.AspNetCore.Components.Web.DataTransfer> and <xref:Microsoft.AspNetCore.Components.Web.DataTransferItem> hold dragged item data.<br><br>Implement drag and drop in Blazor apps using [JS interop](xref:blazor/call-javascript-from-dotnet) with [HTML Drag and Drop API](https://developer.mozilla.org/docs/Web/API/HTML_Drag_and_Drop_API). |
 | Error            | <xref:Microsoft.AspNetCore.Components.Web.ErrorEventArgs> | `onerror` |
 | Event            | <xref:System.EventArgs> | *General*<br>`onactivate`, `onbeforeactivate`, `onbeforedeactivate`, `ondeactivate`, `onfullscreenchange`, `onfullscreenerror`, `onloadeddata`, `onloadedmetadata`, `onpointerlockchange`, `onpointerlockerror`, `onreadystatechange`, `onscroll`<br><br>*Clipboard*<br>`onbeforecut`, `onbeforecopy`, `onbeforepaste`<br><br>*Input*<br>`oninvalid`, `onreset`, `onselect`, `onselectionchange`, `onselectstart`, `onsubmit`<br><br>*Media*<br>`oncanplay`, `oncanplaythrough`, `oncuechange`, `ondurationchange`, `onemptied`, `onended`, `onpause`, `onplay`, `onplaying`, `onratechange`, `onseeked`, `onseeking`, `onstalled`, `onstop`, `onsuspend`, `ontimeupdate`, `onvolumechange`, `onwaiting`<br><br><xref:Microsoft.AspNetCore.Components.Web.EventHandlers> holds attributes to configure the mappings between event names and event argument types. |
 | Focus            | <xref:Microsoft.AspNetCore.Components.Web.FocusEventArgs> | `onfocus`, `onblur`, `onfocusin`, `onfocusout`<br><br>Doesn't include support for `relatedTarget`. |