Introduce font-face styles generator and printer.

Introducing Font Face, a server-side `@font-face` styles generator and printer. 

tl;dr:
* Introduces Font Face.
* Deprecates `_wp_theme_json_webfonts_handler()`.

**Introduce Font Face**

From an array of fonts (i.e. each font-family and its font variations to be processed), it:

1. Validates each `font-face` declaration, i.e. the CSS property and value pairing. If validation fails, processing stops with no font-face styles printed.
3. Generates the `@font-face` CSS for each font-family.
4. Prints the CSS within a `<style id="wp-fonts-local">` element.

The entry point into Font Face is through a new global function called `wp_print_font_faces()`, which is automatically called:

* when the `'wp_head'` hook runs (for the front-end).
* when the `'admin_print_styles'` hook runs (for the back-end).
* when `_wp_get_iframed_editor_assets()` runs to inject the `@font-face` styles into the iframed editor.

Once called, it gets the fonts from Theme_JSON merged data layer, which includes theme defined fonts and user activated fonts (once the Font Library #59166 is introduced into Core).

For classic sites, themes and plugins can directly call `wp_print_font_faces()` and pass their fonts array to it for processing.

**Deprecates `_wp_theme_json_webfonts_handler()`.**

As Font Face is a direct replacement, the stopgap code in `_wp_theme_json_webfonts_handler()` (introduced in 6.0.0 via [53282]) is deprecated and unused in Core.

**Props note:**
There's a long multiple year history baked into Font Face, which dates back to the early versions of a web font API (see #46370 and [https://github.com/WordPress/gutenberg/issues/41479 roadmap]. The props list includes those who contributed from those early versions up to this commit.

**References:**
* #46370 original (Web)Fonts API proposal for registering and enqueuing web fonts.
* [https://github.com/WordPress/gutenberg/issues/41479 Gutenberg tracking issue] which includes the evolution from Webfonts API to Fonts API to Font Face.
* [53282] / #55567 Added the stopgap code `_wp_theme_json_webfonts_handler()` in 6.0.
* [https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face @font-face on mdn web docs]
* #59166 Font Library: Font manager for WordPress

Follow-up to [53282].

Props aristath, jonoaldersonwp, hellofromTonya, andraganescu, annezazu, antonvlasenko, arena, askdesign, azaozz, bph, bradley2083, colorful-tones, costdev, davidbaumwald, desrosj, dingo_d, djcowan, domainsupport, dryanpress, elmastudio, flixos90, francina, garrett-eclipse, gigitux, grantmkin, grapplerulrich, gziolo, ironprogrammer, jb510, jeffpaul, jeremyyip, jffng, joostdevalk, jorgefilipecosta, juanmaguitar, mamaduka, matveb, mburridge, mitogh, ndiego, ntsekouras, oandregal, ocean90, oglekler, paaljoachim, pagelab, peterwilsoncc, poena, priethor, scruffian, SergeyBiryukov, shiloey, simison, skorasaurus, soean, westonruter, wildworks, zaguiini.
Fixes #59165.

git-svn-id: https://develop.svn.wordpress.org/trunk@56500 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/data/themedir1/fonts-block-theme/assets/fonts/dm-sans/LICENSE.txt

@@ -0,0 +1,94 @@
+Copyright 2014-2017 Indian Type Foundry (info@indiantypefoundry.com). Copyright 2019 Google LLC.
+Copyright 2014-2018 Adobe (http://www.adobe.com/), with Reserved Font Name 'Source'. All Rights Reserved. Source is a trademark of Adobe in the United States and/or other countries. Copyright 2019 Google LLC.
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

tests/phpunit/data/themedir1/fonts-block-theme/assets/fonts/open-sans/OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2020 The Open Sans Project Authors (https://github.com/googlefonts/opensans)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

tests/phpunit/data/themedir1/fonts-block-theme/assets/fonts/source-serif-pro/LICENSE.md

@@ -0,0 +1,93 @@
+Copyright 2014 - 2021 Adobe Systems Incorporated (http://www.adobe.com/), with Reserved Font Name 'Source'. All Rights Reserved. Source is a trademark of Adobe Systems Incorporated in the United States and/or other countries.
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+
+This license is copied below, and is also available with a FAQ at: http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded,
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+   in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+   redistributed and/or sold with any software, provided that each copy
+   contains the above copyright notice and this license. These can be
+   included either as stand-alone text files, human-readable headers or
+   in the appropriate machine-readable metadata fields within text or
+   binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+   Name(s) unless explicit written permission is granted by the corresponding
+   Copyright Holder. This restriction only applies to the primary font name as
+   presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+   Software shall not be used to promote, endorse or advertise any
+   Modified Version, except to acknowledge the contribution(s) of the
+   Copyright Holder(s) and the Author(s) or with their explicit written
+   permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+   must be distributed entirely under this license, and must not be
+   distributed under any other license. The requirement for fonts to
+   remain under this license does not apply to any document created
+   using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

tests/phpunit/data/themedir1/fonts-block-theme/style.css

@@ -1,7 +1,7 @@
 /*
-Theme Name: Webfonts theme
+Theme Name: Block Theme with defined Typography Fonts
 Theme URI: https://wordpress.org/
 Description: For testing purposes only.
 Version: 1.0.0
-Text Domain: webfonts-theme
+Text Domain: fonts-block-theme
 */

tests/phpunit/data/themedir1/fonts-block-theme/styles/variation-duplicate-fonts.json

@@ -0,0 +1,40 @@
+{
+	"version": 2,
+	"title": "Variation: duplicate fonts",
+	"settings": {
+		"typography": {
+			"fontFamilies": [
+				{
+					"fontFamily": "\"DM Sans\", sans-serif",
+					"name": "DM Sans",
+					"slug": "dm-sans",
+					"fontFace": [
+						{
+							"fontFamily": "DM Sans",
+							"fontStretch": "normal",
+							"fontStyle": "normal",
+							"fontWeight": "400",
+							"src": [
+								"file:./assets/fonts/dm-sans/DMSans-Regular.woff2"
+							]
+						},
+						{
+							"fontFamily": "DM Sans",
+							"fontStretch": "normal",
+							"fontStyle": "normal",
+							"fontWeight": "700",
+							"src": [
+								"file:./assets/fonts/dm-sans/DMSans-Bold.woff2"
+							]
+						}
+					]
+				}
+			]
+		}
+	},
+	"styles": {
+		"typography": {
+			"fontFamily": "var(--wp--preset--font-family--dm-sans)"
+		}
+	}
+}

tests/phpunit/data/themedir1/fonts-block-theme/styles/variation-new-font-family.json

@@ -0,0 +1,40 @@
+{
+	"version": 2,
+	"title": "Variation: new font family",
+	"settings": {
+		"typography": {
+			"fontFamilies": [
+				{
+					"fontFamily": "\"Open Sans\", serif",
+					"name": "Open Sans",
+					"slug": "open-sans",
+					"fontFace": [
+						{
+							"fontFamily": "Open Sans",
+							"fontStretch": "normal",
+							"fontStyle": "normal",
+							"fontWeight": "400",
+							"src": [
+								"file:./assets/fonts/open-sans/OpenSans-VariableFont_wdth,wght.tff"
+							]
+						},
+						{
+							"fontFamily": "Open Sans",
+							"fontStretch": "normal",
+							"fontStyle": "italic",
+							"fontWeight": "400",
+							"src": [
+								"file:./assets/fonts/open-sans/OpenSans-Italic-VariableFont_wdth,wght.tff"
+							]
+						}
+					]
+				}
+			]
+		}
+	},
+	"styles": {
+		"typography": {
+			"fontFamily": "var(--wp--preset--font-family--open-sans)"
+		}
+	}
+}

tests/phpunit/data/themedir1/fonts-block-theme/styles/variation-new-font-variations.json

@@ -0,0 +1,40 @@
+{
+	"version": 2,
+	"title": "Variation: new font variations",
+	"settings": {
+		"typography": {
+			"fontFamilies": [
+				{
+					"fontFamily": "\"DM Sans\", sans-serif",
+					"name": "DM Sans",
+					"slug": "dm-sans",
+					"fontFace": [
+						{
+							"fontFamily": "DM Sans",
+							"fontStretch": "normal",
+							"fontStyle": "normal",
+							"fontWeight": "500",
+							"src": [
+								"file:./assets/fonts/dm-sans/DMSans-Medium.woff2"
+							]
+						},
+						{
+							"fontFamily": "DM Sans",
+							"fontStretch": "normal",
+							"fontStyle": "italic",
+							"fontWeight": "500",
+							"src": [
+								"file:./assets/fonts/dm-sans/DMSans-Medium-Italic.woff2"
+							]
+						}
+					]
+				}
+			]
+		}
+	},
+	"styles": {
+		"typography": {
+			"fontFamily": "var(--wp--preset--font-family--dm-sans)"
+		}
+	}
+}

tests/phpunit/data/themedir1/fonts-block-theme/styles/variation-no-fonts.json

@@ -0,0 +1,9 @@
+{
+	"version": 2,
+	"title": "Variation - no fonts",
+	"styles": {
+		"typography": {
+			"fontFamily": "var(--wp--preset--font-family--dm-sans)"
+		}
+	}
+}

tests/phpunit/data/themedir1/fonts-block-theme/theme.json

@@ -0,0 +1,112 @@
+{
+	"version": 2,
+	"settings": {
+		"appearanceTools": true,
+		"color": {
+			"palette": [
+				{
+					"slug": "light",
+					"name": "Light",
+					"color": "#f5f7f9"
+				},
+				{
+					"slug": "dark",
+					"name": "Dark",
+					"color": "#000"
+				}
+			]
+		},
+		"typography": {
+			"dropCap": false,
+			"fluid": true,
+			"fontFamilies": [
+				{
+					"fontFace": [
+						{
+							"fontFamily": "DM Sans",
+							"fontStretch": "normal",
+							"fontStyle": "normal",
+							"fontWeight": "400",
+							"src": [
+								"file:./assets/fonts/dm-sans/DMSans-Regular.woff2"
+							]
+						},
+						{
+							"fontFamily": "DM Sans",
+							"fontStretch": "normal",
+							"fontStyle": "italic",
+							"fontWeight": "400",
+							"src": [
+								"file:./assets/fonts/dm-sans/DMSans-Regular-Italic.woff2"
+							]
+						},
+						{
+							"fontFamily": "DM Sans",
+							"fontStretch": "normal",
+							"fontStyle": "normal",
+							"fontWeight": "700",
+							"src": [
+								"file:./assets/fonts/dm-sans/DMSans-Bold.woff2"
+							]
+						},
+						{
+							"fontFamily": "DM Sans",
+							"fontStretch": "normal",
+							"fontStyle": "italic",
+							"fontWeight": "700",
+							"src": [
+								"file:./assets/fonts/dm-sans/DMSans-Bold-Italic.woff2"
+							]
+						}
+					],
+					"fontFamily": "\"DM Sans\", sans-serif",
+					"name": "DM Sans",
+					"slug": "dm-sans"
+				},
+				{
+					"fontFamily": "-apple-system,BlinkMacSystemFont,\"Segoe UI\",Roboto,Oxygen-Sans,Ubuntu,Cantarell,\"Helvetica Neue\",sans-serif",
+					"name": "System Font",
+					"slug": "system-font"
+				},
+				{
+					"fontFace": [
+						{
+							"fontFamily": "Source Serif Pro",
+							"fontStretch": "normal",
+							"fontStyle": "normal",
+							"fontWeight": "200 900",
+							"src": [
+								"file:./assets/fonts/source-serif-pro/SourceSerif4Variable-Roman.ttf.woff2"
+							]
+						},
+						{
+							"fontFamily": "Source Serif Pro",
+							"fontStretch": "normal",
+							"fontStyle": "italic",
+							"fontWeight": "200 900",
+							"src": [
+								"file:./assets/fonts/source-serif-pro/SourceSerif4Variable-Italic.ttf.woff2"
+							]
+						}
+					],
+					"fontFamily": "\"Source Serif Pro\", serif",
+					"name": "Source Serif Pro",
+					"slug": "source-serif-pro"
+				}
+			]
+		},
+		"useRootPaddingAwareAlignments": true
+	},
+	"styles": {
+		"typography": {
+			"fontFamily": "var(--wp--preset--font-family--system-font)"
+		}
+	},
+	"templateParts": [
+		{
+			"name": "small-header",
+			"title": "Small Header",
+			"area": "header"
+		}
+	]
+}

tests/phpunit/data/themedir1/webfonts-theme/functions.php

@@ -1 +0,0 @@
-<?php

tests/phpunit/data/themedir1/webfonts-theme/index.php

@@ -1,4 +0,0 @@
-<?php
-/**
- * Block theme.
- */

tests/phpunit/data/themedir1/webfonts-theme/theme.json

@@ -1,103 +0,0 @@
-{
-  "version": 2,
-  "customTemplates": [
-	{
-	  "name": "blank",
-	  "title": "Blank",
-	  "postTypes": [
-		"page",
-		"post"
-	  ]
-	}
-  ],
-  "settings": {
-	"appearanceTools": true,
-	"color": {
-	  "duotone": [],
-	  "gradients": [],
-	  "palette": []
-	},
-	"custom": {},
-	"spacing": {
-	  "units": [
-		"%",
-		"px",
-		"em",
-		"rem",
-		"vh",
-		"vw"
-	  ]
-	},
-	"typography": {
-	  "dropCap": false,
-	  "fontFamilies": [
-		{
-		  "fontFamily": "\"Source Serif Pro\", serif",
-		  "name": "Source Serif Pro",
-		  "slug": "source-serif-pro",
-		  "fontFace": [
-			{
-			  "fontFamily": "Source Serif Pro",
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-			},
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-		},
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-		  "slug": "x-large"
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-	}
-  },
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-	"color": {
-	  "background": "var(--wp--preset--color--background)",
-	  "text": "var(--wp--preset--color--foreground)"
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-	"spacing": {
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-	  "name": "header",
-	  "title": "Header",
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-}