chrome.fontSettings

Description

Use the chrome.fontSettings API to manage Chrome's font settings.

Permissions

fontSettings

To use the Font Settings API, you must declare the "fontSettings" permission in the extension manifest. For example:

{
  "name": "My Font Settings Extension",
  "description": "Customize your fonts",
  "version": "0.2",
  "permissions": [
    "fontSettings"
  ],
  ...
}

Concepts and usage

Chrome allows for some font settings to depend on certain generic font families and language scripts. For example, the font used for sans-serif Simplified Chinese may be different than the font used for serif Japanese.

The generic font families supported by Chrome are based on CSS generic font families and are listed under GenericReference. When a web page specifies a generic font family, Chrome selects the font based on the corresponding setting. If no generic font family is specified, Chrome uses the setting for the "standard" generic font family.

When a web page specifies a language, Chrome selects the font based on the setting for the corresponding language script. If no language is specified, Chrome uses the setting for the default, or global, script.

The supported language scripts are specified by ISO 15924 script code and listed under ScriptCode. Technically, Chrome settings are not strictly per-script but also depend on language. For example, Chrome chooses the font for Cyrillic (ISO 15924 script code "Cyrl") when a web page specifies the Russian language, and uses this font not just for Cyrillic script but for everything the font covers, such as Latin.

Examples

The following code gets the standard font for Arabic.

chrome.fontSettings.getFont(
  { genericFamily: 'standard', script: 'Arab' },
  function(details) { console.log(details.fontId); }
);

The next snippet sets the sans-serif font for Japanese.

chrome.fontSettings.setFont(
  { genericFamily: 'sansserif', script: 'Jpan', fontId: 'MS PGothic' }
);

To try this API, install the fontSettings API example from the chrome-extension-samples repository.

Types

FontName

Represents a font name.

Properties

  • displayName

    string

    The display name of the font.

  • fontId

    string

    The font ID.

GenericFamily

A CSS generic font family.

Enum

"standard"

"sansserif"

"serif"

"fixed"

"cursive"

"fantasy"

"math"

LevelOfControl

One of not\_controllable: cannot be controlled by any extension controlled\_by\_other\_extensions: controlled by extensions with higher precedence controllable\_by\_this\_extension: can be controlled by this extension controlled\_by\_this\_extension: controlled by this extension

Enum

"not_controllable"

"controlled_by_other_extensions"

"controllable_by_this_extension"

"controlled_by_this_extension"

ScriptCode

An ISO 15924 script code. The default, or global, script is represented by script code "Zyyy".

Enum

"Afak"

"Arab"

"Armi"

"Armn"

"Avst"

"Bali"

"Bamu"

"Bass"

"Batk"

"Beng"

"Blis"

"Bopo"

"Brah"

"Brai"

"Bugi"

"Buhd"

"Cakm"

"Cans"

"Cari"

"Cham"

"Cher"

"Cirt"

"Copt"

"Cprt"

"Cyrl"

"Cyrs"

"Deva"

"Dsrt"

"Dupl"

"Egyd"

"Egyh"

"Egyp"

"Elba"

"Ethi"

"Geor"

"Geok"

"Glag"

"Goth"

"Gran"

"Grek"

"Gujr"

"Guru"

"Hang"

"Hani"

"Hano"

"Hans"

"Hant"

"Hebr"

"Hluw"

"Hmng"

"Hung"

"Inds"

"Ital"

"Java"

"Jpan"

"Jurc"

"Kali"

"Khar"

"Khmr"

"Khoj"

"Knda"

"Kpel"

"Kthi"

"Lana"

"Laoo"

"Latf"

"Latg"

"Latn"

"Lepc"

"Limb"

"Lina"

"Linb"

"Lisu"

"Loma"

"Lyci"

"Lydi"

"Mand"

"Mani"

"Maya"

"Mend"

"Merc"

"Mero"

"Mlym"

"Moon"

"Mong"

"Mroo"

"Mtei"

"Mymr"

"Narb"

"Nbat"

"Nkgb"

"Nkoo"

"Nshu"

"Ogam"

"Olck"

"Orkh"

"Orya"

"Osma"

"Palm"

"Perm"

"Phag"

"Phli"

"Phlp"

"Phlv"

"Phnx"

"Plrd"

"Prti"

"Rjng"

"Roro"

"Runr"

"Samr"

"Sara"

"Sarb"

"Saur"

"Sgnw"

"Shaw"

"Shrd"

"Sind"

"Sinh"

"Sora"

"Sund"

"Sylo"

"Syrc"

"Syre"

"Syrj"

"Syrn"

"Tagb"

"Takr"

"Tale"

"Talu"

"Taml"

"Tang"

"Tavt"

"Telu"

"Teng"

"Tfng"

"Tglg"

"Thaa"

"Thai"

"Tibt"

"Tirh"

"Ugar"

"Vaii"

"Visp"

"Wara"

"Wole"

"Xpeo"

"Xsux"

"Yiii"

"Zmth"

"Zsym"

"Zyyy"

Methods

clearDefaultFixedFontSize()

Promise 
chrome.fontSettings.clearDefaultFixedFontSize(
  details?: object,
  callback?: function,
)

Clears the default fixed font size set by this extension, if any.

Parameters

  • details

    object optional

    This parameter is currently unused.

  • callback

    function optional

    The callback parameter looks like: 

    ()=>void

Returns

  • Promise<void>

    Chrome 96+

    Promises are supported in Manifest V3 and later, but callbacks are provided for backward compatibility. You cannot use both on the same function call. The promise resolves with the same type that is passed to the callback.

clearDefaultFontSize()

Promise 
chrome.fontSettings.clearDefaultFontSize(
  details?: object,
  callback?: function,
)

Clears the default font size set by this extension, if any.

Parameters

  • details

    object optional

    This parameter is currently unused.

  • callback

    function optional

    The callback parameter looks like: 

    ()=>void

Returns

  • Promise<void>

    Chrome 96+

    Promises are supported in Manifest V3 and later, but callbacks are provided for backward compatibility. You cannot use both on the same function call. The promise resolves with the same type that is passed to the callback.

clearFont()

Promise 
chrome.fontSettings.clearFont(
  details: object,
  callback?: function,
)

Clears the font set by this extension, if any.

Parameters

  • details

    object

    • genericFamily

      GenericFamily

      The generic font family for which the font should be cleared.

    • script

      ScriptCode optional

      The script for which the font should be cleared. If omitted, the global script font setting is cleared.

  • callback

    function optional

    The callback parameter looks like: 

    ()=>void

Returns

  • Promise<void>

    Chrome 96+

    Promises are supported in Manifest V3 and later, but callbacks are provided for backward compatibility. You cannot use both on the same function call. The promise resolves with the same type that is passed to the callback.

clearMinimumFontSize()

Promise 
chrome.fontSettings.clearMinimumFontSize(
  details?: object,
  callback?: function,
)

Clears the minimum font size set by this extension, if any.

Parameters

  • details

    object optional

    This parameter is currently unused.

  • callback

    function optional

    The callback parameter looks like: 

    ()=>void

Returns

  • Promise<void>

    Chrome 96+

    Promises are supported in Manifest V3 and later, but callbacks are provided for backward compatibility. You cannot use both on the same function call. The promise resolves with the same type that is passed to the callback.

getDefaultFixedFontSize()

Promise 
chrome.fontSettings.getDefaultFixedFontSize(
  details?: object,
  callback?: function,
)

Gets the default size for fixed width fonts.

Parameters

  • details

    object optional

    This parameter is currently unused.

  • callback

    function optional

    The callback parameter looks like: 

    (details: object)=>void

    • details

      object

      • levelOfControl

        LevelOfControl

        The level of control this extension has over the setting.

      • pixelSize

        number

        The font size in pixels.

Returns

  • Promise<object>

    Chrome 96+

    Promises are supported in Manifest V3 and later, but callbacks are provided for backward compatibility. You cannot use both on the same function call. The promise resolves with the same type that is passed to the callback.

getDefaultFontSize()

Promise 
chrome.fontSettings.getDefaultFontSize(
  details?: object,
  callback?: function,
)

Gets the default font size.

Parameters

  • details

    object optional

    This parameter is currently unused.

  • callback

    function optional

    The callback parameter looks like: 

    (details: object)=>void

    • details

      object

      • levelOfControl

        LevelOfControl

        The level of control this extension has over the setting.

      • pixelSize

        number

        The font size in pixels.

Returns

  • Promise<object>

    Chrome 96+

    Promises are supported in Manifest V3 and later, but callbacks are provided for backward compatibility. You cannot use both on the same function call. The promise resolves with the same type that is passed to the callback.

getFont()

Promise 
chrome.fontSettings.getFont(
  details: object,
  callback?: function,
)

Gets the font for a given script and generic font family.

Parameters

  • details

    object

    • genericFamily

      GenericFamily

      The generic font family for which the font should be retrieved.

    • script

      ScriptCode optional

      The script for which the font should be retrieved. If omitted, the font setting for the global script (script code "Zyyy") is retrieved.

  • callback

    function optional

    The callback parameter looks like: 

    (details: object)=>void

    • details

      object

      • fontId

        string

        The font ID. Rather than the literal font ID preference value, this may be the ID of the font that the system resolves the preference value to. So, fontId can differ from the font passed to setFont, if, for example, the font is not available on the system. The empty string signifies fallback to the global script font setting.

      • levelOfControl

        LevelOfControl

        The level of control this extension has over the setting.

Returns

  • Promise<object>

    Chrome 96+

    Promises are supported in Manifest V3 and later, but callbacks are provided for backward compatibility. You cannot use both on the same function call. The promise resolves with the same type that is passed to the callback.

getFontList()

Promise 
chrome.fontSettings.getFontList(
  callback?: function,
)

Gets a list of fonts on the system.

Parameters

  • callback

    function optional

    The callback parameter looks like: 

    (results: FontName[])=>void

Returns

  • Promise<FontName[]>

    Chrome 96+

    Promises are supported in Manifest V3 and later, but callbacks are provided for backward compatibility. You cannot use both on the same function call. The promise resolves with the same type that is passed to the callback.

getMinimumFontSize()

Promise 
chrome.fontSettings.getMinimumFontSize(
  details?: object,
  callback?: function,
)

Gets the minimum font size.

Parameters

  • details

    object optional

    This parameter is currently unused.

  • callback

    function optional

    The callback parameter looks like: 

    (details: object)=>void

    • details

      object

      • levelOfControl

        LevelOfControl

        The level of control this extension has over the setting.

      • pixelSize

        number

        The font size in pixels.

Returns

  • Promise<object>

    Chrome 96+

    Promises are supported in Manifest V3 and later, but callbacks are provided for backward compatibility. You cannot use both on the same function call. The promise resolves with the same type that is passed to the callback.

setDefaultFixedFontSize()

Promise 
chrome.fontSettings.setDefaultFixedFontSize(
  details: object,
  callback?: function,
)

Sets the default size for fixed width fonts.

Parameters

  • details

    object

    • pixelSize

      number

      The font size in pixels.

  • callback

    function optional

    The callback parameter looks like: 

    ()=>void

Returns

  • Promise<void>

    Chrome 96+

    Promises are supported in Manifest V3 and later, but callbacks are provided for backward compatibility. You cannot use both on the same function call. The promise resolves with the same type that is passed to the callback.

setDefaultFontSize()

Promise 
chrome.fontSettings.setDefaultFontSize(
  details: object,
  callback?: function,
)

Sets the default font size.

Parameters

  • details

    object

    • pixelSize

      number

      The font size in pixels.

  • callback

    function optional

    The callback parameter looks like: 

    ()=>void

Returns

  • Promise<void>

    Chrome 96+

    Promises are supported in Manifest V3 and later, but callbacks are provided for backward compatibility. You cannot use both on the same function call. The promise resolves with the same type that is passed to the callback.

setFont()

Promise 
chrome.fontSettings.setFont(
  details: object,
  callback?: function,
)

Sets the font for a given script and generic font family.

Parameters

  • details

    object

    • fontId

      string

      The font ID. The empty string means to fallback to the global script font setting.

    • genericFamily

      GenericFamily

      The generic font family for which the font should be set.

    • script

      ScriptCode optional

      The script code which the font should be set. If omitted, the font setting for the global script (script code "Zyyy") is set.

  • callback

    function optional

    The callback parameter looks like: 

    ()=>void

Returns

  • Promise<void>

    Chrome 96+

    Promises are supported in Manifest V3 and later, but callbacks are provided for backward compatibility. You cannot use both on the same function call. The promise resolves with the same type that is passed to the callback.

setMinimumFontSize()

Promise 
chrome.fontSettings.setMinimumFontSize(
  details: object,
  callback?: function,
)

Sets the minimum font size.

Parameters

  • details

    object

    • pixelSize

      number

      The font size in pixels.

  • callback

    function optional

    The callback parameter looks like: 

    ()=>void

Returns

  • Promise<void>

    Chrome 96+

    Promises are supported in Manifest V3 and later, but callbacks are provided for backward compatibility. You cannot use both on the same function call. The promise resolves with the same type that is passed to the callback.

Events

onDefaultFixedFontSizeChanged

chrome.fontSettings.onDefaultFixedFontSizeChanged.addListener(
  callback: function,
)

Fired when the default fixed font size setting changes.

Parameters

  • callback

    function

    The callback parameter looks like: 

    (details: object)=>void

    • details

      object

      • levelOfControl

        LevelOfControl

        The level of control this extension has over the setting.

      • pixelSize

        number

        The font size in pixels.

onDefaultFontSizeChanged

chrome.fontSettings.onDefaultFontSizeChanged.addListener(
  callback: function,
)

Fired when the default font size setting changes.

Parameters

  • callback

    function

    The callback parameter looks like: 

    (details: object)=>void

    • details

      object

      • levelOfControl

        LevelOfControl

        The level of control this extension has over the setting.

      • pixelSize

        number

        The font size in pixels.

onFontChanged

chrome.fontSettings.onFontChanged.addListener(
  callback: function,
)

Fired when a font setting changes.

Parameters

  • callback

    function

    The callback parameter looks like: 

    (details: object)=>void

    • details

      object

      • fontId

        string

        The font ID. See the description in getFont.

      • genericFamily

        GenericFamily

        The generic font family for which the font setting has changed.

      • levelOfControl

        LevelOfControl

        The level of control this extension has over the setting.

      • script

        ScriptCode optional

        The script code for which the font setting has changed.

onMinimumFontSizeChanged

chrome.fontSettings.onMinimumFontSizeChanged.addListener(
  callback: function,
)

Fired when the minimum font size setting changes.

Parameters

  • callback

    function

    The callback parameter looks like: 

    (details: object)=>void

    • details

      object

      • levelOfControl

        LevelOfControl

        The level of control this extension has over the setting.

      • pixelSize

        number

        The font size in pixels.