Not pure HTML

Code view:

A painting is a person's account of this edit as text, recorded independently of the node mapping - a rendering often has several equally defensible answers where the mapping has one. Deletions and insertions carry no position on the opposite side in a painting, so that panel draws no caret for them.

Before

1---
2layout: examples
3title: Cover Template
4extra_css:
5 - "cover.css"
6html_class: "h-100"
7body_class: "d-flex h-100 text-center text-bg-dark"
8include_js: false
9---
10
11<div class="cover-container d-flex w-100 h-100 p-3 mx-auto flex-column">
12 <header class="mb-auto">
13 <div>
14 <h3 class="float-md-start mb-0">Cover</h3>
…lines 15–35 unchanged (21 lines)

After

1---
2layout: examples
3title: Cover Template
4extra_css:
5 - "cover.css"
6html_class: "h-100"
7body_class: "d-flex h-100 text-center text-bg-dark"
…lines 8–34 unchanged (27 lines)

Before

document
text "---\nlayout: examples\ntitle: Cover Template\nextra_css:\n - \"c"...
element (+312 nodes collapsed)

After

document
text "---\nlayout: examples\ntitle: Cover Template\nextra_css:\n - \"c"...
element (+312 nodes collapsed)