If you've ever encountered a parser blocking cross-origin script that gets invoked via a document write, you know how frustrating it can be. But worry not, as I'm here to guide you through how to circumvent this issue smoothly.
First and foremost, let's understand the problem at hand. When a parser blocking cross-origin script is triggered through a document write function, it can significantly impact the performance of your web page. This happens because the browser must pause parsing the HTML content to fetch and execute the script, disrupting the loading process and slowing down the rendering of your page.
To tackle this challenge, one effective approach is to defer the loading of scripts. By deferring the execution of scripts that are not essential for the initial page load, you allow the browser to continue parsing and rendering the page without interruptions.
One way to defer the loading of scripts is by utilizing the async and defer attributes in your script tags. The async attribute tells the browser to fetch the script asynchronously while allowing the HTML parsing to continue. However, keep in mind that the order of script execution may not be guaranteed when using async.
On the other hand, the defer attribute ensures that the script is fetched asynchronously but executed only after the HTML parsing is complete. This can help prevent parser blocking and improve the overall performance of your web page.
Here's an example of how you can modify your script tag to leverage the defer attribute:
By adding the defer attribute to your script tag, you instruct the browser to defer the execution of the script, minimizing the impact on the parsing process.
Another technique to bypass the parser blocking script invoked via document write is to load the script dynamically using JavaScript. Instead of relying on document write to insert the script directly into the HTML, you can use the createElement and appendChild methods to load the script programmatically.
Here's a basic example showcasing how you can dynamically load a script without triggering parser blocking:
const script = document.createElement('script');
script.src = 'your-script.js';
document.body.appendChild(script);By dynamically loading the script in this manner, you have more control over when the script gets executed, allowing for a smoother user experience without causing parser blocking delays.
In conclusion, dealing with a parser blocking cross-origin script invoked via document write may seem daunting at first, but with the right strategies in place, you can mitigate its impact and enhance the performance of your web pages. Remember to defer script loading, leverage async and defer attributes, and consider dynamically loading scripts to optimize your website's loading speed and user experience.