Mojtaba Seyedi

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The sibling-count() CSS function returns the total number of sibling elements an element has, including itself. Think of it sort of as the CSS equivalent of JavaScript’s element.parentElement.children.length.…

The sibling-index() CSS function returns the position of an element among its siblings, starting from 1. It's similar to :nth-child(), but instead of using it in selectors, you can now use the index directly within CSS functions and calculations.

The :defined pseudo-class selector is part of CSS Selectors Level 4 specification allowing you to target custom elements created with the Web Components API and defined in JavaScript. Also, this selector matches any standard element built into the browser.…

The CSS :has() pseudo-class selects elements that contain other elements that match the selector passed into its arguments. It’s often referred to as “the parent selector” because of its ability to select a parent element based on the child elements …

The grid-area CSS property is a shorthand that specifies the location and the size of a grid item in a grid layout by setting the value of grid-row-start, grid-column-start, grid-row-end and grid-column-end in one declaration.

.grid-container {
  display: 

…

The grid-row CSS property is a shorthand that specifies the row grid lines where a grid item starts and ends in a grid layout, and does it in a single declaration.

.grid-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.grid-item:nth-child(2) 

…

The grid-column CSS property is a shorthand that specifies the column grid lines where a grid item starts and ends in a grid layout in one declaration.

.grid-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.grid-item:nth-child(2) {
  grid-column: 3 / 

…

The grid-row-end CSS property is part of the CSS Grid Layout specification, used to indicate the row grid line where a grid item ends in a grid layout. This property — among other line-based placement grid properties — controls …

The grid-row-start CSS property is part of the CSS Grid Layout specification, used to indicate the row grid line where a grid item starts in a grid layout. This property — among other line-based placement grid properties — controls …