fix: HTML Validation issues

[nschonni]

No description provided.

[github-actions]

Preview URLs

• https://pr4916.content.dev.mdn.mozit.cloud/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Controlling_Ratios_of_Flex_Items_Along_the_Main_Ax
• https://pr4916.content.dev.mdn.mozit.cloud/en-US/docs/Web/CSS/@property
• https://pr4916.content.dev.mdn.mozit.cloud/en-US/docs/Web/API/USBConnectionEvent/USBConnectionEvent

Flaws

None! 🎉

External URLs

URL: /en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Controlling_Ratios_of_Flex_Items_Along_the_Main_Ax
Title: Controlling Ratios of Flex Items Along the Main Axis
on GitHub

No new external URLs

---

URL: /en-US/docs/Web/CSS/@property
Title: @property
on GitHub

No new external URLs

---

URL: /en-US/docs/Web/API/USBConnectionEvent/USBConnectionEvent
Title: USBConnectionEvent.USBConnectionEvent()
on GitHub

No new external URLs