YouTipCss3 Pr All
## CSS `all` Property
The CSS `all` shorthand property resets all CSS properties of an element to their initial, inherited, or unset state. It is an exceptionally powerful tool for resetting styles, isolating components, and preventing unwanted style inheritance.
The only properties that are **not** affected by the `all` property are `unicode-bidi` and `direction`.
---
### Quick Example
The following example demonstrates how to reset all styling of a `div` element back to its default browser state:
```css
div {
background-color: yellow;
color: red;
all: initial; /* Resets background-color, color, and all other properties */
}
```
---
## Definition and Usage
The `all` property allows you to control the behavior of all CSS properties applied to an element at once. This is particularly useful when building reusable web components or widgets that need to be completely isolated from the global styles of the parent page.
### Technical Specifications
| Feature | Description |
| :--- | :--- |
| **Default Value** | `none` (No reset is applied) |
| **Inherited** | No |
| **Animatable** | No (Individual properties reset by `all` may be animatable, but the `all` shorthand itself is not) |
| **CSS Version** | CSS3 |
| **JavaScript Syntax** | `object.style.all = "initial"` |
---
## Browser Support
The numbers in the table specify the minimum browser version that fully supports the `all` property.
| Property | Chrome | Edge | Internet Explorer | Firefox | Safari | Opera |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| **`all`** | 37.0 | 79.0 | *Not Supported* | 27.0 | 9.1 | 24.0 |
---
## CSS Syntax
```css
all: initial | inherit | unset | revert | revert-layer;
```
---
## Property Values
| Value | Description |
| :--- | :--- |
| `initial` | Resets all properties of the element to their default CSS initial values (as defined by the CSS specifications). |
| `inherit` | Forces all properties of the element to inherit their values from its parent element. |
| `unset` | Resets all properties of the element to their inherited value if they naturally inherit, or to their initial value if they do not. |
| `revert` | Rolls back the style cascade so that the property takes on the value it would have had if no styles had been applied to the current element by the author. |
| `revert-layer` | Rolls back the style cascade to the previous cascade layer, if one exists. |
---
## Practical Examples
### Example 1: Resetting a Component with `all: initial`
In this example, we have a container with custom styles, but we want a specific child element to ignore those styles and revert to the browser's default styling.
```html
```
```css
.custom-widget {
color: #007bff;
font-size: 20px;
font-family: 'Courier New', Courier, monospace;
}
/* Reset all properties for this specific class */
.reset-me {
all: initial;
}
```
### Example 2: Forcing Inheritance with `all: inherit`
If you want an element to completely match its parent's styling for every single property, you can use `all: inherit`.
```css
.child-element {
all: inherit;
}
```
---
## Considerations and Best Practices
1. **The `direction` and `unicode-bidi` Exception**: Remember that `all` does not affect text direction properties. If your layout relies on changing text direction (e.g., RTL languages), you must manage `direction` and `unicode-bidi` separately.
2. **Performance**: Using `all` is highly efficient for CSS resets within web components (like Shadow DOM), but overusing it on every element in a large document can make debugging styles difficult.
3. **Use `unset` for Natural Resets**: In most practical scenarios, `all: unset` is preferred over `all: initial`. `unset` is smarter because it preserves natural inheritance (like `color` and `font-family`) while resetting non-inherited properties (like `margin` and `padding`).