Remove improper uses of var in a11y

[teoli2003]

This PR removes all the remaining improper uses of var in web/accessibility \o/.

[github-actions[bot]]

Preview URLs

• https://pr19345.content.dev.mdn.mozit.cloud/en-US/docs/Web/Accessibility/ARIA/ARIA_Live_Regions
• https://pr19345.content.dev.mdn.mozit.cloud/en-US/docs/Web/Accessibility/ARIA/Roles/alert_role
• https://pr19345.content.dev.mdn.mozit.cloud/en-US/docs/Web/Accessibility/ARIA/Roles/button_role
• https://pr19345.content.dev.mdn.mozit.cloud/en-US/docs/Web/Accessibility/ARIA
• https://pr19345.content.dev.mdn.mozit.cloud/en-US/docs/Web/Accessibility/An_overview_of_accessible_web_applications_and_widgets

Flaws

Note! 4 documents with no flaws that don't need to be listed. 🎉

URL: /en-US/docs/Web/Accessibility/ARIA/Roles/button_role Title: ARIA: button role on GitHub Flaw count: 1

• broken_links:
  • Can't resolve /en-US/docs/Web/API/Document/keypress_event

External URLs

URL: /en-US/docs/Web/Accessibility/ARIA Title: ARIA on GitHub

No new external URLs

---

URL: /en-US/docs/Web/Accessibility/ARIA/ARIA_Live_Regions Title: ARIA live regions on GitHub

No new external URLs

---

URL: /en-US/docs/Web/Accessibility/ARIA/Roles/button_role Title: ARIA: button role on GitHub

No new external URLs

---

URL: /en-US/docs/Web/Accessibility/ARIA/Roles/alert_role Title: ARIA: alert role on GitHub

No new external URLs

---

URL: /en-US/docs/Web/Accessibility/An_overview_of_accessible_web_applications_and_widgets Title: An overview of accessible web applications and widgets on GitHub

No new external URLs