What is host property in css?

The :host pseudo-class selector is used to target styles in the element that hosts the component. Since the host element is in a parent component's template, you can't reach the host element from inside the component by other means. For example, you can create a border for parent element as below,

//Other styles for app.component.css
:host {
display: block;
border: 1px solid black;
padding: 20px;

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Made by Michael Sakhniuk