Additional, unstyled language marker `<span class="lang>...` rendered on top left of code blocks

[remyhunt]

Is this an issue or maybe an accesibility feature? It's very high contract which makes me think it might be for accesibility. For context, the other indicator on the top right is a ::before element.

[remyhunt]

realized this is related to Vitepress, i'll move the quesiton to there