JavaScript Cross-Browser Harmony-Cross-Browser JavaScript Solutions

Example

Using `if ('fetch' in window) { ... }` to check if the Fetch API is supported before using it, and providing an XMLHttpRequest fallback if it's not.

Scenario

This is crucial in a web application that relies on making network requests. If a browser does not support the Fetch API, the application can still use XMLHttpRequest to make requests, ensuring functionality is preserved across browsers.

Example

Including a polyfill script for Array.prototype.includes in your HTML to add support for the method in browsers that don't natively support it.

Scenario

This is useful in scenarios where your JavaScript codebase makes extensive use of the `.includes()` method on arrays, which is not available in Internet Explorer. By including a polyfill, you ensure that the code works as intended in all targeted browsers.

Example

Designing a web feature that uses CSS Grid Layout but also defines a fallback layout using Flexbox for browsers that do not support Grid.

Scenario

This approach is beneficial for ensuring that a website remains functional and visually coherent even in browsers that haven't yet implemented CSS Grid Layout. Users in both modern and older browsers have a satisfactory experience, although the presentation may differ slightly.