Reproducible in vscode.dev or in VS Code Desktop?

• Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• Not reproducible in the monaco editor playground

Monaco Editor Playground Link

https://microsoft.github.io/monaco-editor/playground.html?source=v0.55.0-dev-20251107#XQAAAAK_BQAAAAAAAABBqQkHQ5NjdPxdelU4WDonmpKI0l8ZnxhC4nZWoCuAJKxoZZcn0NoL7hbtycI-KVso3hyOWZPoky0J3nxQx8SlilhIluPIv9y8o1iPogzx7efS0zuJUWlhXey9rLBx5DHddr7uilPEWupI5TlBi5gNvhEE1blHHx0J4OkmWGx7Rfr5wBMG33E8LTEj0ovfa8eq7N7kjZl-uvoQ71URuDraU4JMamg_HhlnjSTth2GYXUcrt-r5Cnxa-fLHN4y55s1xbFbEhrvoWdkYavRsFzrkQFoSEfivMn5w-WegZ3hJeQ7nTaLVCerXmEibf40FBsfxvSQojfcr-sTYOVdlmVR6u3_a8-AyfxZoU5wzUY2d3iOkdqgs21MWkQh07GJgbLE4AjHEPORwlDMxpj4VLmO43V-H-upaKorvH2W4MlNGOEeya0bz08I6y6Tv5Y4qSbVvg2lRv8jl6r9_3vMk6k5387EWOXc3vQZ2fyQUk0tYqBp-xz1HBbJ3PPvuUNb9gsXWaAylxa7N-l-Ls1ZIMJ1Kz9oOPIFqQRJtMRJwOJ8pUIKtri7fLsDtQ6laa0Kw3UDv1oGEO65hsoXf_XBfR65uur_Zf4Gn7oaeypEFQyvyKzAB6UH7DMeqOXaut2YIc-QiJBDZgdC_orsMrK-xiZMJCDlThssRRHo4MnFbyCjmUalgo3_v3AnZIBnd9r_ee3qijNPadZa4FzclWomdtiE09v2WKn9OMhMJU3Ax7cPr9Iz27BTkoLcPMW1ixO7AMq9YadJlxqOSpQAB76ZP6IEP1ipKSGgzxScZ-H2s3fN-QxxF9zKw2IzygjlHvFenul6z9b-nNMXg_YoPRdKALbODwu5C9W43GQMRAxUoUc5rjow5eTJgU4VyIPB9LD7XGF4Jr7XkoRtjSLIFjsdNeBUAL_3KoC-AANghn89M5-f8ZPwU6O7aVd3dXWmrcYNP-cJwSG8bhUBeso-mMPY2V7TimryWJPh9ixfNfXz6ZZ87GdmE90yWk0L4-v5Qbo7ku7Ho3OO_592AOlbpUMT5twy9h_7U6iI

Monaco Editor Playground Code

Reproduction Steps

Use the "Configure JavaScript Defaults" example, enable semantic validation, introduce an error in the code (e.g. next() -> nex()) and add div with some height into the HTML snippet before the editor

<div style="height: 50px">test</div>

Actual (Problematic) Behavior

Hovering the new "Copy" button of the diagnostic text shows the tooltip offset from the button by the height of the preceding HTML element (in this example 50px), and the text itself uses a serif font different from the rest of the editor

Expected Behavior

Tooltip is aligned properly and uses consistent font.

Additional Context

0.55.0-dev-20251107