que es el box-sizing en css in javascript

The box-sizing property in CSS determines what kind of box model a certain element should use to calculate its width and height. In Javascript, you can access and modify this property using the style property of an element.

Here's an example:

index.tsx
// Get the element you want to modify
const myElement = document.getElementById('my-element');

// Set the box-sizing property to border-box
myElement.style.boxSizing = 'border-box';
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In the example above, myElement is a reference to an HTML element with an id attribute of my-element. We then set the box-sizing property of that element to border-box.

Note that this only affects the specific element that you're modifying. If you want to modify multiple elements, you'll need to loop through them and set the style.boxSizing property for each element individually.