How do you handle element size in React Native? 

React Native follows the box model concept of CSS, where the size of an element is determined by its content, padding, border, and margin. The simplest way to set an element’s size is by specifying the width and height CSS properties. In React Native, all dimensions are unitless and represent density-independent pixels, ensuring consistent element sizes across different screen sizes when using fixed values. 

However, if you need to set dimensions as a percentage, React Native does not directly support this. Instead, it provides the Dimensions module, which gives the width and height of the mobile device. This information can be used to dynamically set an element’s style at runtime, allowing for responsive design by calculating percentage-based dimensions. 

Below is an example of how to use the Dimension module from React native: 

Importing module from React Native: 

import { Dimension } from ‘react-native’; 

Figure out the width and height of the device: 

const deviceWidth = Dimension.get(“window”).width; 

const deviceHeight = Dimension.get(“window”).height; 

Calculate the style value:

Width: deviceWidth*<percentageValue>/100 

But the simplest way is by setting width and height CSS for an element.