What would be an example of 'Checking for Blocked Requests' JavaScript?

Here's a simple example of JavaScript code that checks for blocked requests, assuming an ad is being loaded from a specific server:

// Example ad server URL
var adServerUrl = "https://adserver.example.com/ads/ad123.jpg";

// Create an image element
var img = new Image();

// Set an event handler for when the image loads successfully
img.onload = function() {
    // The ad was loaded successfully
    console.log("Ad loaded");
};

// Set an event handler for when the image fails to load
img.onerror = function() {
    // The ad failed to load, indicating a potential AdBlocker
    console.log("Ad blocked by AdBlocker");
};

// Set the source URL of the image to the ad server URL
img.src = adServerUrl;

In this example, an Image object is created and assigned an onload event handler for when the ad image successfully loads, and an onerror event handler for when the ad fails to load. If the ad is blocked by an AdBlocker, the onerror event will be triggered, and the corresponding message will be logged to the console.

Keep in mind that this is a basic example, and real-world implementations may involve more sophisticated techniques. Also, users who are aware of these methods may find ways to circumvent them, so such techniques are not foolproof. Additionally, it's important to consider user privacy and ensure that any such checks are done responsibly and in compliance with privacy regulations.