[Bug] `~~~`s with an invalid language (like `~~~log`) render the encapsulated `>`/`<blockquote>` below the visual boundary of the `<pre><code>`.

Bắt đầu bằng cách tái hiện các ví dụ fenced-code trong github/markup, so sánh một ngôn ngữ không hợp lệ như log với dạng blockquote > của Markdown và các ví dụ về ngôn ngữ hợp lệ. Được xem là hoàn tất khi blockquote vẫn nằm trong ranh giới pre/code hiển thị thay vì kéo dài xuống bên dưới; issue không cung cấp tệp hoặc test cụ thể nào để bắt đầu.

Errata (Examples)

1. Markdown Quotation Block

   Evaluation Content
   

   …(whose markup is undermentioned):

   > ```txt
   > Evaluation Content
   > ```
   

2. HTML Quotation Block

   …and the undermentioned:

   Evaluation Content
   

   …whose markup is undermentioned):

   > ```log
   > Evaluation Content
   > ```
   

If you scroll on the latter, you shall see that it renders the blockquote line further than the actual content, as a consequence of the <blockQuote> statement being necessarily defined a line after the fenced code block content. However, this shouldn't occur, not least because it doesn't when defining a block quote using Markdown >s.

Bitmap Depiction

In case it doesn't render like that to you, what I see is undermentioned:

My Environment

1. #!/usr/bin/env python3
   import rpm, yaml
   from datetime import datetime, timezone
   from shutil import which
   package = which("firefox-nightly")
   header = next(
   	rpm.TransactionSet().dbMatch(
   		"basenames",
   		package
   	)
   )
   tags = (
   	"NAME",
   	"VERSION",
   	"RELEASE",
   	"ARCH",
   	"INSTALLTIME",
   	"SIZE",
   	"SIGPGP",
   	"SOURCERPM",
   	"BUILDTIME",
   	"BUILDHOST",
   	"PACKAGER",
   	"VENDOR",
   )
   properties = {}
   for name in tags:
   	value = header[
   		getattr(
   			rpm,
   			f"RPMTAG_{name}"
   		)
   	]
   	if name in (
   		"INSTALLTIME",
   		"BUILDTIME"
   	):
   		value = (
   			datetime.fromtimestamp(
   				value,
   				timezone.utc
   			)
   			.isoformat(timespec="seconds")
   			.replace(
   				"+00:00",
   				"Z"
   			)
   		)
   	properties[name] = value
   print(
   	yaml.safe_dump(
   		properties,
   		sort_keys=False,
   		default_flow_style=False,
   	)
   )
   

2. NAME: firefox-nightly
   VERSION: 157.0a1
   RELEASE: '20260831085937'
   ARCH: x86_64
   INSTALLTIME: '2026-09-01T00:07:43Z'
   SIZE: 400365634
   SIGPGP: null
   SOURCERPM: firefox-nightly-157.0a1-20260831085937.src.rpm
   BUILDTIME: '2026-08-31T11:02:30Z'
   BUILDHOST: 81a14f63898f
   PACKAGER: null
   VENDOR: Mozilla
   

Affected