feat(Button): rewise documented title prop with aria-label documentation

packages/dnb-design-system-portal/src/docs/uilib/components/button/demos.mdx

@@ -78,6 +78,10 @@ Large Signal button with medium sized icon. To import custom icons, use: `import
 
 ### Icon button
 
+When the button has no text an `aria-label` attribute is required for accessibility. And a `title` attribute is recommended for mouse hover.
+
+We automatically add an `aria-label` with the same value as `title` if `text` and `children` props are undefined. So in most cases you only have to set the `title` prop.
+
 <ButtonIcon />
 
 ### Custom button content

packages/dnb-design-system-portal/src/docs/uilib/components/button/properties.mdx

@@ -8,7 +8,7 @@ showTabs: true
 | --------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | `type`                                  | _(optional)_ `button`, `reset` or `submit` for the `type` HTML attribute. Defaults to `button` for legacy reasons.                                                                                                                                                     |
 | `text` or `children`                    | _(optional)_ the content of the button can be a string or a React Element.                                                                                                                                                                                             |
-| `title`                                 | _(optional)_ title of the button. Optional, but should always be included because of accessibility.                                                                                                                                                                    |
+| `aria-label` or `title`                 | _(optional)_ required if there is no text in the button. If `text` and `children` are undefined, setting the `title` prop will automatically set `aria-label` with the same value.                                                                                     |
 | `variant`                               | _(optional)_ defines the kind of button. Possible values are `primary`, `secondary`, `tertiary` and `signal`. Defaults to `primary` (or `secondary` if icon only).                                                                                                     |
 | `size`                                  | _(optional)_ the size of the button. For now there is `small`, `medium`, `default` and `large`.                                                                                                                                                                        |
 | `icon`                                  | _(optional)_ to be included in the button. [Primary Icons](/icons/primary) can be set as a string (e.g. `icon="chevron_right"`), other icons should be set as React elements.                                                                                          |

packages/dnb-eufemia/src/components/button/Button.js

@@ -229,6 +229,9 @@ export default class Button extends React.PureComponent {
     if (Element !== Anchor && !params.type) {
       params.type = params.type === '' ? undefined : 'button'
     }
+    if (isIconOnly) {
+      params['aria-label'] = params['aria-label'] || title
+    }
 
     skeletonDOMAttributes(params, skeleton, this.context)
 
@@ -279,7 +282,7 @@ export default class Button extends React.PureComponent {
 Button.propTypes = {
   text: PropTypes.oneOfType([PropTypes.string, PropTypes.node]),
   type: PropTypes.string,
-  title: PropTypes.node,
+  title: PropTypes.string,
   variant: buttonVariantPropType.variant,
   size: PropTypes.oneOf(['default', 'small', 'medium', 'large']),
   icon: PropTypes.oneOfType([
@@ -460,7 +463,7 @@ function Content({
 }
 
 Content.propTypes = {
-  title: PropTypes.node,
+  title: PropTypes.string,
   custom_content: PropTypes.node,
   content: PropTypes.oneOfType([
     PropTypes.string,

packages/dnb-eufemia/src/components/button/__tests__/Button.test.tsx

@@ -36,6 +36,15 @@ describe('Button component', () => {
     expect(button.getAttribute('title')).toBe(title)
   })
 
+  it('icon button should set aria-label with title', () => {
+    const title = 'title'
+    render(<Button icon="bell" title={title} />)
+    const button = document.querySelector('button')
+
+    expect(button.getAttribute('title')).toBe(title)
+    expect(button.getAttribute('aria-label')).toBe(title)
+  })
+
   it('icon only has to have some extra classes', () => {
     render(<Button icon="question" />)
     const button = document.querySelector('button')