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8 changes: 8 additions & 0 deletions src/wp-includes/kses.php
Original file line number Diff line number Diff line change
Expand Up @@ -2277,6 +2277,7 @@ function kses_init() {
* nested `var()` values, and assigning values to CSS variables.
* Added support for `object-fit`, `gap`, `column-gap`, `row-gap`, and `flex-wrap`.
* Extended `margin-*` and `padding-*` support for logical properties.
* @since 6.2.0 Added support for `position`, `top`, `right`, `bottom`, `left` and `z-index` position CSS properties.
*
* @param string $css A string of CSS rules.
* @param string $deprecated Not used.
Expand Down Expand Up @@ -2438,6 +2439,13 @@ function safecss_filter_attr( $css, $deprecated = '' ) {
'overflow',
'vertical-align',

'position',
'top',
'right',
'bottom',
'left',
'z-index',

// Custom CSS properties.
'--*',
)
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5 changes: 5 additions & 0 deletions tests/phpunit/tests/kses.php
Original file line number Diff line number Diff line change
Expand Up @@ -1278,6 +1278,11 @@ public function data_test_safecss_filter_attr() {
'css' => '--?><.%-not-allowed: red;',
'expected' => '',
),
// Position properties introduced in 6.2.
array(
'css' => 'position: sticky;top: 0;left: 0;right: 0;bottom: 0;z-index: 10;',
'expected' => 'position: sticky;top: 0;left: 0;right: 0;bottom: 0;z-index: 10',
),
);
}

Expand Down