Test Environment:
Version: Version 24H2 (OS Build 26231.5000)
Browser Version: 127.0.2638.2 (Official build) dev (64-bit)
URL: https://tsdoc.org/play/
Screen Reader: Narrator

Repro Steps:

1. Open the above URL on the EDGE Dev browser.
2. Press the tab key and navigate to the 'PlayGround' option and press enter key to activate it.
3. Navigate the page and observe the issue.

Actual Result:
There is no visual page heading is present on the page as h1 which describe the page information.

Expected Result:
There should be a descriptive page heading should be defined as H1. Visual Label should be defined as 'Playground document heading level 1.'

Note:
It should be same as it is on 'Intro, Tags, Github and Help' page.

WCAG Reference:
https://www.w3.org/WAI/WCAG21/Understanding/headings-and-labels

Have feedback on bugs logged, please tag bug as “A11yRCA” and add your feedback in the comment.