Preventing obsolete JavaScript from being delivered to modern browsers

Making website more secure and faster? One piece of advice you may get is Prevent obsolete JavaScript from being delivered to modern browsers. What is Preventing Obsolete JavaScript from being delivered to modern browsers and how exactly does this work on a Web site? On this page, we explain this to you.

What is Preventing obsolete JavaScript from being delivered to modern browsers?

Preventing outdated JavaScript from being delivered to modern browsers is one of the pieces of advice that a program like Lighthouse or Google PageSpeed Insights gives you. It says something about the speed and security of your website. By optimizing this, you benefit from more security and better load times.

The danger of outdated JavaScript

Nearly all Web pages on the Internet use JavaScript, a well-known programming language that provides needed extra functionality on a page. However, there are occasional instances of outdated JavaScript. And when the page delivers this to a modern browser, it potentially causes a slowdown in loading speed.

Are you using Google Chrome, Internet Explorer, Mozilla FireFox or one of the many other available browsers? In all cases, it is possible that there is obsolete JavaScript. Outdated JavaScript makes websites insecure and easier to hack. Therefore, it is important to avoid this.

The impact of Preventing Obsolete JavaScript from being delivered to modern browsers on SEO

Preventing outdated JavaScript from being delivered to modern browsers potentially impacts the SEO of a website or page. It mainly impacts the security of a Web page, but the reliability of a Web page is very important for SEO. Providing outdated JavaScript is not conducive to security and therefore not conducive to SEO; by avoiding it, it is definitely

My advice

Outdated JavaScript: It is not always obvious that you are dealing with this, especially when you do not have the technical knowledge yourself. Therefore, we recommend hiring a programmer with JavaScript experience. In this way, it is possible to update outdated code and make other necessary changes. This ensures you more security on the website.

The most complete book on website speed

I’ve written so much about speeding up websites and everything involved that I like to divide it into different sections; general, tools, speed improvement points and tips. Feel free to see and consult all the links below to learn more about tools and tips for speeding up your website.

General

Tools

Verbter points for speed

General tips

Senior SEO-specialist

Ralf van Veen

Senior SEO-specialist
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I have been working for 10 years as an independent SEO specialist for companies (in the Netherlands and abroad) that want to rank higher in Google in a sustainable manner. During this period I have consulted A-brands, set up large-scale international SEO campaigns and coached global development teams in the field of search engine optimization.

With this broad experience within SEO, I have developed the SEO course and helped hundreds of companies with improved findability in Google in a sustainable and transparent way. For this you can consult my portfolio, references and collaborations.

This article was originally published on 22 March 2024. The last update of this article was on 22 March 2024. The content of this page was written and approved by Ralf van Veen. Learn more about the creation of my articles in my editorial guidelines.

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