add getFormControls() method

docs/getting-started/form-controls.md

@@ -355,3 +355,18 @@ This example demonstrates custom validation styles using `data-user-invalid` and
   }
 </style>
 ```
+
+## Getting Associated Form Controls
+
+At this time, using [`HTMLFormElement.elements`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/elements) will not return Shoelace form controls because the browser is unaware of their status as custom element form controls. Fortunately, Shoelace provides an `elements()` function that does something very similar. However, instead of returning an [`HTMLFormControlsCollection`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormControlsCollection), it returns an array of HTML and Shoelace form controls in the order they appear in the DOM.
+
+```js
+import { getFormControls } from '@shoelace-style/shoelace/dist/utilities/form.js';
+
+const form = document.querySelector('#my-form');
+const formControls = getFormControls(form);
+
+console.log(formControls); // e.g. [input, sl-input, ...]
+```
+
+?> You probably don't need this function! If you're gathering form data for submission, you probably want to look at the [Data Serialization](#data-serializing) instead.

docs/resources/changelog.md

@@ -15,6 +15,7 @@ New versions of Shoelace are released as-needed and generally occur when a criti
 - Added `sl-hover` event to `<sl-rating>` [#1125](https://github.com/shoelace-style/shoelace/issues/1125)
 - Added the `@documentation` tag with a link to the docs for each component
 - Added the `form` attribute to all form controls to allow placing them outside of a `<form>` element [#1130](https://github.com/shoelace-style/shoelace/issues/1130)
+- Added the `getFormControls()` function as an alternative to `HTMLFormElement.elements`
 - Fixed a bug in `<sl-select>` that prevented placeholders from showing when `multiple` was used [#1109](https://github.com/shoelace-style/shoelace/issues/1109)
 - Fixed a bug in `<sl-select>` that caused tags to not be rounded when using the `pill` attribute [#1117](https://github.com/shoelace-style/shoelace/issues/1117)
 - Fixed a bug in `<sl-select>` where the `sl-change` and `sl-input` events didn't weren't emitted when removing tags [#1119](https://github.com/shoelace-style/shoelace/issues/1119)