Add backtick to escape angle brackets:
`<title>abc</title>`
<details>
<summary>Click me</summary>
### Heading
1. Expand by defaut set: details open
2. Bar
* Baz
* Qux
### Some Javascript
```js
function logSomething(something) {
console.log('Something', something);
}
```
</details>
function logSomething(something) {
console.log('Something', something);
}
<blockquote>
is not part of the original Markdown syntax.
<blockquote>
This is a blockquote.
</blockquote>