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docs: describe falsy and nullish attribute behavior #4498

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Mar 2, 2020
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docs: describe falsy and nullish attribute behavior #4498

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11 changes: 11 additions & 0 deletions site/content/docs/02-template-syntax.md
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Expand Up @@ -58,6 +58,17 @@ Or they can *be* JavaScript expressions.

---

Boolean attributes are included on the element if their value is [truthy](https://developer.mozilla.org/en-US/docs/Glossary/Truthy) and excluded if it's [falsy](https://developer.mozilla.org/en-US/docs/Glossary/Falsy).

All other attributes are included unless their value is [nullish](https://developer.mozilla.org/en-US/docs/Glossary/Nullish) (`null` or `undefined`).

```html
<input required={false} placeholder="This input field is not required">
<div title={null}>This div has no title attribute</div>
```

---

An expression might include characters that would cause syntax highlighting to fail in regular HTML, so quoting the value is permitted. The quotes do not affect how the value is parsed:

```html
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