There are three whitespace minification methods. When processing text content, hyperbuild chooses which ones to use depending on the containing element.
<details>
<summary>
##### Collapse whitespace
</summary>
> **Applies to:** text in root and any element except [whitespace sensitive](./src/spec/tag/wss.rs) elements.
> **Applies to:** text in root and any element except [whitespace sensitive](./src/spec/tag/wss.rs), [content](./src/spec/tag/content.rs), [content-first](./src/spec/tag/contentfirst.rs), and [formatting](./src/spec/tag/formatting.rs) elements.
> **Applies to:** text in root and any element except [whitespace sensitive](./src/spec/tag/wss.rs) and [formatting](./src/spec/tag/formatting.rs) elements.
hyperbuild groups elements based on how it assumes they are used. By making these assumptions, it can apply optimal whitespace minification strategies.
|[Content-first](#content-first-elements)|`label`, `li`, [and others](./src/spec/tag/contentfirst.rs)|Like content element but could have exactly one of an layout element's expected content elements.|
##### Formatting elements
> Whitespace is collapsed.
Formatting elements are usually inline elements that wrap around part of some text in a content element, so its whitespace isn't trimmed as they're probably part of the content.
##### Content elements
> Whitespace is trimmed and collapsed.
Content elements usually represent a contiguous and complete unit of content such as a paragraph. As such, whitespace is significant but sequences of them are most likely due to formatting.
> Whitespace is trimmed and collapsed. [Whole whitespace](#destroy-whole-whitespace) is removed.
These elements should only contain other elements and no text. This makes it possible to [remove whole whitespace](#destroy-whole-whitespace), which is useful when using `display: inline-block` so that whitespace between elements (e.g. indentation) does not alter layout and styling.
###### Before
```html
<ul>↵
··<li>A</li>↵
··<li>B</li>↵
··<li>C</li>↵
</ul>
```
###### After
```html
<ul><li>A</li><li>B</li><li>C</li></ul>
```
##### Content-first elements
> Whitespace is trimmed and collapsed.
These elements are usually like [content elements](#content-elements) but are occasionally used like a layout element with one child. Whole whitespace is not removed as it might contain content, but this is OK for using as layout as there is only one child and whitespace is trimmed.
hyperbuild is an HTML minifier and simply does HTML minification. hyperbuild almost does no syntax checking or standards enforcement for performance and code complexity reasons.
For example, this means that it's not an error to have self-closing tags, declare multiple `<body>` elements, use incorrect attribute names and values, or write something like `<br>alert('');</br>`
They are interpreted as characters representing their decoded value. This means that `	` is considered a whitespace character and could be minified.
Malformed entities are interpreted literally as a sequence of characters.
If a named entity is an invalid reference as per the [spec](https://html.spec.whatwg.org/multipage/named-characters.html#named-character-references), it is considered malformed.
Numeric character references that do not reference a valid [Unicode Scalar Value](https://www.unicode.org/glossary/#unicode_scalar_value) are considered malformed.
It is an error to place whitespace between `=` and attribute names/values. It is also an error if there is no whitespace before an attribute. For example:
