Title: WP_Theme_JSON::is_safe_css_declaration
Published: February 3, 2022
Last modified: May 20, 2026

---

# WP_Theme_JSON::is_safe_css_declaration( string $property_name, string $property_value ): bool

## In this article

 * [Parameters](https://developer.wordpress.org/reference/classes/wp_theme_json/is_safe_css_declaration/?output_format=md#parameters)
 * [Return](https://developer.wordpress.org/reference/classes/wp_theme_json/is_safe_css_declaration/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/classes/wp_theme_json/is_safe_css_declaration/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/classes/wp_theme_json/is_safe_css_declaration/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/classes/wp_theme_json/is_safe_css_declaration/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/classes/wp_theme_json/is_safe_css_declaration/?output_format=md#wp--skip-link--target)

Checks that a declaration provided by the user is safe.

## 󠀁[Parameters](https://developer.wordpress.org/reference/classes/wp_theme_json/is_safe_css_declaration/?output_format=md#parameters)󠁿

 `$property_name`stringrequired

Property name in a CSS declaration, i.e. the `color` in `color: red`.

`$property_value`stringrequired

Value in a CSS declaration, i.e. the `red` in `color: red`.

## 󠀁[Return](https://developer.wordpress.org/reference/classes/wp_theme_json/is_safe_css_declaration/?output_format=md#return)󠁿

 bool

## 󠀁[Source](https://developer.wordpress.org/reference/classes/wp_theme_json/is_safe_css_declaration/?output_format=md#source)󠁿

    ```php
    protected static function is_safe_css_declaration( $property_name, $property_value ) {
    	$style_to_validate = $property_name . ': ' . $property_value;
    	$filtered          = esc_html( safecss_filter_attr( $style_to_validate ) );
    	return ! empty( trim( $filtered ) );
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/class-wp-theme-json.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.0/src/wp-includes/class-wp-theme-json.php#L3988)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/class-wp-theme-json.php#L3988-L3992)

## 󠀁[Related](https://developer.wordpress.org/reference/classes/wp_theme_json/is_safe_css_declaration/?output_format=md#related)󠁿

| Uses | Description | 
| [safecss_filter_attr()](https://developer.wordpress.org/reference/functions/safecss_filter_attr/)`wp-includes/kses.php` |

Filters an inline style attribute and removes disallowed rules.

  | 
| [esc_html()](https://developer.wordpress.org/reference/functions/esc_html/)`wp-includes/formatting.php` |

Escaping for HTML blocks.

  |

## 󠀁[Changelog](https://developer.wordpress.org/reference/classes/wp_theme_json/is_safe_css_declaration/?output_format=md#changelog)󠁿

| Version | Description | 
| [5.9.0](https://developer.wordpress.org/reference/since/5.9.0/) | Introduced. |

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