chore: add missing info on the purpose of scrollbar-width property (m…

…dn#35873)

* chore: add missing info on the purpose of scrollbar-width property

* Update files/en-us/web/css/scrollbar-width/index.md

Co-authored-by: Estelle Weyl <[email protected]>

* Update files/en-us/web/css/scrollbar-width/index.md

Co-authored-by: Onkar Khadangale <[email protected]>

* chore: update values section in order to be compliant with css property page templating

---------

Co-authored-by: Estelle Weyl <[email protected]>
Co-authored-by: Onkar Khadangale <[email protected]>

files/en-us/web/css/scrollbar-width/index.md

@@ -7,7 +7,12 @@ browser-compat: css.properties.scrollbar-width
 
 {{CSSRef}}
 
-The **`scrollbar-width`** property allows the author to set the maximum thickness of an element's scrollbars when they are shown.
+The **`scrollbar-width`** property allows the author to set the desired thickness of an element's scrollbars when they are shown.
+
+The purpose of the `scrollbar-width` is to optimize the space occupied by the scrollbar on a page or element; the purpose is not related to scrollbar aesthetics. The `scrollbar-width` predefined keyword values indicate to the user agent whether a normal or smaller scrollbar should be rendered. Avoid using `none`, as hiding a scrollbar negatively impacts [accessibility](#accessibility).
+
+> [!NOTE]
+> For elements that are scrollable only via programmatic means and not by direct user interaction, use the {{cssxref("overflow")}} property with a value of `hidden` rather than `scrollbar-width: none`.
 
 ## Syntax
 
@@ -27,29 +32,12 @@ scrollbar-width: unset;
 
 ### Values
 
-- `<scrollbar-width>`
-
-  - : Defines the width of the scrollbar as a keyword. It must be one of the following values:
-
-    <table class="standard-table">
-      <tbody>
-        <tr>
-          <td><code>auto</code></td>
-          <td>The default scrollbar width for the platform.</td>
-        </tr>
-        <tr>
-          <td><code>thin</code></td>
-          <td>
-            A thin scrollbar width variant on platforms that provide that option, or
-            a thinner scrollbar than the default platform scrollbar width.
-          </td>
-        </tr>
-        <tr>
-          <td><code>none</code></td>
-          <td>No scrollbar shown, however the element will still be scrollable.</td>
-        </tr>
-      </tbody>
-    </table>
+- `auto`
+  - : The default scrollbar width for the platform.
+- `thin`
+  - : A thin scrollbar width variant on platforms that provide that option, or a thinner scrollbar than the default platform scrollbar width.
+- `none`
+  - : No scrollbar shown, however the element will still be scrollable.
 
 > [!NOTE]
 > User Agents must apply any `scrollbar-width` value set on the root element to the viewport.