A component doesn’t expose its DOM nodes by default. You can opt into exposing a DOM node by using forwardRef and passing the second ref argument down to a specific node.
Less (which stands for Leaner Style Sheets) is a backwards-compatible language extension for CSS.
Bootstrap is a free (MIT license) front-end development framework for the creation of websites and web apps. Bootstrap is a powerful, feature-packed front-end toolkit.
Tooltip is a floating element that displays information related to an anchor element when it receives keyboard focus or the mouse hovers over it.
How to fix Type 'readonly Book | null' is not assignable to type 'readonly Book'. Type 'null' is not assignable to type 'readonly Book' in NgRx Walkthrough tutorial