---
name: StyleBase
last_updated: 2026-06-11T23:11:57Z
inherits:
  - Instance
  - Object
type: class
memory_category: Gui
tags:
  - NotCreatable
summary: "The base class for StyleSheet and StyleRule."
---

# Class: StyleBase

> The base class for [StyleSheet](/docs/reference/engine/classes/StyleSheet.md) and [StyleRule](/docs/reference/engine/classes/StyleRule.md).

## Description

The base class for [StyleSheet](/docs/reference/engine/classes/StyleSheet.md) and [StyleRule](/docs/reference/engine/classes/StyleRule.md). Holds a list of
child [StyleRules](/docs/reference/engine/classes/StyleRule.md), as well as token definitions which are
stored as [attributes](/docs/en-us/studio/properties.md#instance-attributes).

## Methods

### Method: StyleBase:GetStyleRules

**Signature:** `StyleBase:GetStyleRules(): List<StyleRule>`

Returns an array of associated [StyleRules](/docs/reference/engine/classes/StyleRule.md).

*Security: None · Thread Safety: Unsafe · Capabilities: UI*

**Returns:** `List<StyleRule>` — Array of [StyleRules](/docs/reference/engine/classes/StyleRule.md).

### Method: StyleBase:InsertStyleRule

**Signature:** `StyleBase:InsertStyleRule(rule: StyleRule, priority: int?): ()`

Inserts a new [StyleRule](/docs/reference/engine/classes/StyleRule.md) into the array of rules so that its
[Priority](/docs/reference/engine/classes/StyleRule.md) is greater than all previous
[StyleRules](/docs/reference/engine/classes/StyleRule.md). If `priority` is specified, sets the new
rule's [Priority](/docs/reference/engine/classes/StyleRule.md) to the specified value.

*Security: None · Thread Safety: Unsafe · Capabilities: UI*

**Parameters:**

| Name | Type | Default | Description |
|------|------|---------|-------------|
| `rule` | `StyleRule` |  | The [StyleRule](/docs/reference/engine/classes/StyleRule.md) to insert. |
| `priority` | `int?` |  | The number to set the rule's [Priority](/docs/reference/engine/classes/StyleRule.md) to. |

**Returns:** `()`

### Method: StyleBase:SetStyleRules

**Signature:** `StyleBase:SetStyleRules(rules: Instances): ()`

Similar to [InsertStyleRule()](/docs/reference/engine/classes/StyleBase.md) but lets
you declare and set multiple [StyleRules](/docs/reference/engine/classes/StyleRule.md) at once.

```lua
local ReplicatedStorage = game:GetService("ReplicatedStorage")

local coreSheet = Instance.new("StyleSheet")
coreSheet.Name = "CoreSheet"
coreSheet.Parent = ReplicatedStorage

local styleRuleA = Instance.new("StyleRule")
styleRuleA.Selector = "Frame"
styleRuleA:SetProperty("BackgroundColor3", Color3.new(1, 0, 0))

local styleRuleB = Instance.new("StyleRule")
styleRuleB.Selector = "Frame"
styleRuleB:SetProperty("BackgroundColor3", Color3.new(0, 1, 0))

coreSheet:SetStyleRules({ styleRuleA, styleRuleB })
```

*Security: None · Thread Safety: Unsafe · Capabilities: UI*

**Parameters:**

| Name | Type | Default | Description |
|------|------|---------|-------------|
| `rules` | `Instances` |  | Array of [StyleRules](/docs/reference/engine/classes/StyleRule.md) to set. |

**Returns:** `()`

## Events

### Event: StyleBase.StyleRulesChanged

**Signature:** `StyleBase.StyleRulesChanged()`

Fires when one or more [StyleRules](/docs/reference/engine/classes/StyleRule.md) is explicitly changed
on the connected [StyleSheet](/docs/reference/engine/classes/StyleSheet.md) or [StyleRule](/docs/reference/engine/classes/StyleRule.md), for example when
[InsertStyleRule()](/docs/reference/engine/classes/StyleBase.md) is called.

*Security: None · Capabilities: UI*

## Inherited Members

### From [Instance](/docs/reference/engine/classes/Instance.md)

- **Property `Archivable`** (`boolean`): Determines if an Instance and its descendants can be cloned using
- **Property `archivable`** (`boolean`):  *(deprecated, hidden)*
- **Property `Capabilities`** (`SecurityCapabilities`): The set of capabilities allowed to be used for scripts inside this
- **Property `Name`** (`string`): A non-unique identifier of the Instance.
- **Property `Parent`** (`Instance`): Determines the hierarchical parent of the Instance.
- **Property `PredictionMode`** (`PredictionMode`): 
- **Property `RobloxLocked`** (`boolean`): A deprecated property that used to protect CoreGui objects. *(hidden)*
- **Property `Sandboxed`** (`boolean`): When enabled, the instance can only access abilities in its `Capabilities`
- **Property `UniqueId`** (`UniqueId`): A unique identifier for the instance.
- **Method `AddTag(tag: string): ()`**: Applies a tag to the instance.
- **Method `children(): Instances`**: Returns an array of the object's children. *(deprecated)*
- **Method `ClearAllChildren(): ()`**: This method destroys all of an instance's children.
- **Method `Clone(): Instance`**: Create a copy of an instance and all its descendants, ignoring instances
- **Method `clone(): Instance`**:  *(deprecated)*
- **Method `Destroy(): ()`**: Sets the Instance.Parent property to `nil`, locks the
- **Method `destroy(): ()`**:  *(deprecated)*
- **Method `FindFirstAncestor(name: string): Instance?`**: Returns the first ancestor of the Instance whose
- **Method `FindFirstAncestorOfClass(className: string): Instance?`**: Returns the first ancestor of the Instance whose
- **Method `FindFirstAncestorWhichIsA(className: string): Instance?`**: Returns the first ancestor of the Instance for whom
- **Method `FindFirstChild(name: string, recursive?: boolean): Instance?`**: Returns the first child of the Instance found with the given name.
- **Method `findFirstChild(name: string, recursive?: boolean): Instance`**:  *(deprecated)*
- **Method `FindFirstChildOfClass(className: string): Instance?`**: Returns the first child of the Instance whose
- **Method `FindFirstChildWhichIsA(className: string, recursive?: boolean): Instance?`**: Returns the first child of the Instance for whom
- **Method `FindFirstDescendant(name: string): Instance?`**: Returns the first descendant found with the given Instance.Name.
- **Method `GetActor(): Actor?`**: Returns the Actor associated with the Instance, if any.
- **Method `GetAttribute(attribute: string): Variant`**: Returns the value which has been assigned to the given attribute name.
- **Method `GetAttributeChangedSignal(attribute: string): RBXScriptSignal`**: Returns an event that fires when the given attribute changes.
- **Method `GetAttributes(): Dictionary`**: Returns a dictionary of the instance's attributes.
- **Method `GetChildren(): Instances`**: Returns an array containing all of the instance's children.
- **Method `getChildren(): Instances`**:  *(deprecated)*
- **Method `GetDebugId(scopeLength?: int): string`**: Returns a coded string of the debug ID used internally by Roblox.
- **Method `GetDescendants(): Instances`**: Returns an array containing all of the descendants of the instance.
- **Method `GetFullName(): string`**: Returns a string describing the instance's ancestry.
- **Method `GetStyled(name: string, selector: string?): Variant`**: Returns the styled or explicitly modified value of the specified property,
- **Method `GetStyledPropertyChangedSignal(property: string): RBXScriptSignal`**: 
- **Method `GetTags(): Array`**: Gets an array of all tags applied to the instance.
- **Method `HasTag(tag: string): boolean`**: Check whether the instance has a given tag.
- **Method `IsAncestorOf(descendant: Instance): boolean`**: Returns true if an Instance is an ancestor of the given
- **Method `IsDescendantOf(ancestor: Instance): boolean`**: Returns `true` if an Instance is a descendant of the given
- **Method `isDescendantOf(ancestor: Instance): boolean`**:  *(deprecated)*
- **Method `IsPropertyModified(property: string): boolean`**: Returns `true` if the value stored in the specified property is not equal
- **Method `QueryDescendants(selector: string): Instances`**: Returns an array containing all descendants of the instance that match the
- **Method `Remove(): ()`**: Sets the object's `Parent` to `nil`, and does the same for all its *(deprecated)*
- **Method `remove(): ()`**:  *(deprecated)*
- **Method `RemoveTag(tag: string): ()`**: Removes a tag from the instance.
- **Method `ResetPropertyToDefault(property: string): ()`**: Resets a property to its default value.
- **Method `SetAttribute(attribute: string, value: Variant): ()`**: Sets the attribute with the given name to the given value.
- **Method `WaitForChild(childName: string, timeOut: double): Instance`**: Returns the child of the Instance with the given name. If the
- **Event `AncestryChanged`**: Fires when the Instance.Parent property of this object or one of
- **Event `AttributeChanged`**: Fires whenever an attribute is changed on the Instance.
- **Event `ChildAdded`**: Fires after an object is parented to this Instance.
- **Event `childAdded`**:  *(deprecated)*
- **Event `ChildRemoved`**: Fires after a child is removed from this Instance.
- **Event `DescendantAdded`**: Fires after a descendant is added to the Instance.
- **Event `DescendantRemoving`**: Fires immediately before a descendant of the Instance is removed.
- **Event `Destroying`**: Fires immediately before (or is deferred until after) the instance is
- **Event `StyledPropertiesChanged`**: Fires whenever any style property is changed on the instance, including

### From [Object](/docs/reference/engine/classes/Object.md)

- **Property `ClassName`** (`string`): A read-only string representing the class this Object belongs to.
- **Property `className`** (`string`):  *(deprecated)*
- **Method `GetPropertyChangedSignal(property: string): RBXScriptSignal`**: Get an event that fires when a given property of the object changes.
- **Method `IsA(className: string): boolean`**: Returns true if an object's class matches or inherits from a given class.
- **Method `isA(className: string): boolean`**:  *(deprecated)*
- **Event `Changed`**: Fires immediately after a property of the object changes, with some