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# Metadata / Element Attributes
Metadata or element attributes are a way to change the behaviour of some
elements.
The syntax for metadata is the same syntax used for defining keys of bibliography entries
in the document.
```
String value
[key = value]
String value
[key = "String value"]
Integer value
[key = 123]
Float value
[key = 1.23]
Boolean
[key = false]
[key] equals [key=true]
```
There are some elements that support metadata:
```
Hide a section (including subsections) in the TOC
#[toc-hidden] Section
Set the size of an image
!(url)[width = 42%, height=auto, brightness=10, contrast=1.2, huerotate=180, invert, grayscale]
Set the source of a quote
[author=Me date=[[date]] display="{{author}} - {{date}}"]> It's me
Set options for placeholders
[[toc]][ordered]
Set the type of an import
<[style.css][type=stylesheet]
```
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