Allow constructors to accept a CSS selector (#32245)

Co-authored-by: XhmikosR <xhmikosr@gmail.com>
Co-authored-by: Mark Otto <otto@github.com>

site/content/docs/5.0/getting-started/javascript.md

@@ -93,6 +93,15 @@ var modal = new bootstrap.Modal(myModalEl, { keyboard: false }) // initialized w
 
 If you'd like to get a particular plugin instance, each plugin exposes a `getInstance` method. In order to retrieve it directly from an element, do this: `bootstrap.Popover.getInstance(myPopoverEl)`.
 
+### CSS selectors in constructors
+
+You can also use a CSS selector as the first argument instead of a DOM element to initialize the plugin. Currently the element for the plugin is found by the `querySelector` method since our plugins support a single element only.
+
+```js
+var modal = new bootstrap.Modal('#myModal')
+var dropdown = new bootstrap.Dropdown('[data-bs-toggle="dropdown"]')
+```
+
 ### Asynchronous functions and transitions
 
 All programmatic API methods are **asynchronous** and return to the caller once the transition is started but **before it ends**.

site/content/docs/5.0/migration.md

@@ -9,6 +9,17 @@ toc: true
 
 ## v5.0.0-beta3
 
+### JavaScript
+
+- All plugins can now accept a CSS selector as the first argument. You can either pass a DOM element or any valid CSS selector to create a new instance of the plugin:
+
+  ```js
+  var modal = new bootstrap.Modal('#myModal')
+  var dropdown = new bootstrap.Dropdown('[data-bs-toggle="dropdown"]')
+  ```
+
+## v5.0.0-beta2
+
 ### Utilities
 
 - Dropped the `0` entry in `$border-widths` map to remove the duplicated `.border-0` class.