Javascript Rendering: Common JS Rendering Issues for Websites

 If you use JavaScript on your internet site—and ninety eight.Eight percentage of web sites do—then knowledge how JavaScript renders and why it’s vital to your website is important.

Why?

Unrendered or poorly rendered JavaScript could have untold influences to your website. It may even go to this point as to effect search engine marketing if Google JavaScript rendering can not take vicinity because it’s supposed to.

The truth is, JavaScript rendering troubles will show up. So understanding why they happen and the way to address them may be the distinction between a poorly rendered internet site or an most desirable consumer (and crawlbot) enjoy.

In this submit, I’ll explain what rendering JavaScript is and why it’s important. My group at NP Digital will even provide an analysis of 3 SaaS manufacturers, consisting of common JavaScript rendering mistakes. Finally, I’ll offer a rundown of the maximum common JS rendering mistakes and the way you may deal with them.

We have a lot to cover, so let’s soar proper in!

Key Findings On JavaScript Rendering

JavaScript rendering is important for internet site usability and capability, impacting complete sections or pages if left unrendered for customers.

NP Digital analyzed three sites to instance capability problems with JavaScript Rendering

Zoom (Brand #1) Analysis:

Analysis of Zoom’s internet site famous differences between uncooked HTML and rendered HTML, such as missing hreflang attributes in raw HTML.

Instances like lacking H1 tags in raw HTML can impact SEO and avert website overall performance.

Asana (Brand #2) Analysis:

Similar to Zoom, Asana faces troubles like differing web page titles in raw HTML and rendered HTML.

Asana has numerous pages with blocked JavaScript resources, however this will be without difficulty fixed through updating the robots.Txt record.

Neil Patel (Brand #three) Analysis:

Neil Patel’s website also well-knownshows attributes displayed in rendered HTML however now not in uncooked HTML.

There was a minimum impact from blocked JavaScript documents, showcasing powerful control of this common problem.

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Why JavaScript Rendering Is Important

JavaScript rendering is crucial from two perspectives.

First, from a consumer attitude, JavaScript rendering is crucial for internet site usability and functionality. Depending on what factors are loaded using JavaScript, whole sections or maybe pages or your internet site may be inoperable if JavaScript is left unrendered.

If JavaScript isn’t rendering for users, then it’s surely no longer rendering for seek engine crawlbots. This manner that Google can't index or rank your internet site on SERPs.

This may have giant implications for search engine optimization, and it’s a large reason why JavaScript search engine optimization needs to be part of your typical SEO and advertising approach.

How Brands are Using JavaScript Rendering

JavaScript is used so broadly that it can be hard to pinpoint what on a internet site is HTML and what's JavaScript. To display you just how not unusual JavaScript is on web sites—and why know-how JavaScript rendering is critical—my crew at NP Digital has assessed 3 SaaS brands.

Using Screaming Frog and source code, we’ve dug into the general website breakdown of URLs to decide just how many are the usage of JavaScript. We’ve also analyzed a page or  from every website online to reveal you the capacity impact that poorly rendered JavaScript could have on SEO.

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Before we dive in, even though, here’s a crash course in HTML rendering and JS rendering.

We’ll be discussing  kinds of HTML formats on this publish. The first is uncooked HTML and the second one is rendered HTML.

Raw HTML: The original model of HTML on a website before JavaScript has loaded.

Rendered HTML: The HTML that is visible after JavaScript has loaded.

Now you may be asking, in which and while does rendering JS take location?

There are two possibilities. The first is server-side rendering, and that is executed at the website’s server before being despatched to the patron (i.E. Consumer browser). This is the most common rendering option as it affords a smoother experience for the consumer.

Server aspect rendering process. 

The second choice is customer-side rendering, where the user’s internet browser have to render the JavaScript earlier than the internet site fully hundreds. This can motive lag and is not encouraged for maximum websites.

Client side rendering method. 

Finally, while we won’t speak is simply too closely, it’s additionally useful to realize how HTML is examine via computers (inclusive of crawlbots). The record item model (DOM) is the shape of an HTML file. The HTML factors are kept become independent from the JavaScript elements, as proven under:

Document item model example. 

Caption: The cease of HTML and the beginning of JavaScript is certainly proven above. 

This is done for many reasons. For builders, it’s less complicated to pinpoint errors and make modifications to the HTML or the JavaScript as wanted. For website rendering purposes, this ensures that HTML factors are nevertheless loaded of their raw version even supposing JavaScript doesn’t render.

Now which you have a few history know-how, permit’s start our evaluation of three SaaS brands: Zoom, Asana, and Neil Patel.

Brand #1: Zoom

The first SaaS logo we analyzed turned into Zoom, a cloud-primarily based video conferencing service.

Using Screaming Frog, the NPD crew ran a scrape of the whole U.S. Model of the Zoom internet site to see how JavaScript can be impacting their website. Screaming Frog is terrific for identifying wherein JavaScript indicates up inside the rendered HTML that Google cares about.

Right away, we can see a difference in the way the hreflang characteristic is dealt with in the authentic HTML as opposed to the rendered HTML. More particularly, hreflang is missing from the unique HTML (traces 39 through fifty six):

Screaming frog hreflang attributes. 

Assuming rendering in JavaScript happens properly, this is not probably to have an effect on the overall performance of the web site. However, by using now not consisting of the hreflang characteristic in the uncooked HTML, there may be the capability that this information isn't always passed to Google.

Let’s study every other example wherein uncooked HTML and rendered HTML vary:

The distinction among uncooked html and rendered html

In the above instance, we can see that the H1 tag is well rendered with JavaScript. However, for the reason that H1 tag isn't always covered in the raw HTML, there may be the capacity for Google to miss this crucial tag if the web page changed into now not nicely rendered.

Instances like this will have most important affects on search engine optimization and avert internet site performance.

It’s now not usually the case that an important property is lacking absolutely from the raw HTML, but rather, it may be unique from what the rendered HTML is displaying. In the below example, the name tag within the raw HTML is “Loading” even as the title tag in the rendered HTML is “Zoom Learning Center”:

Raw HTML vs Rendered HTML. 

This is an instance where JavaScript is updating the web page identify dynamically, but if JavaScript didn’t render then Google would no longer index the proper web page title.

One element to observe is that JavaScript mistakes are not unusual, and that they don’t commonly have a huge effect on web page rendering. We can see this via searching on the source code and seeing that each one applicable information we might assume to look on a web page—ordinarily HTML tags—are seen. 

This doesn’t suggest that JavaScript errors can’t be complex for other motives, although.

Just take, as an example, Zoom’s writer pages like this one for Janine Pelosi:

Janine Pelosi Zoom weblog publish. 

In this example, the uncooked HTML doesn’t have the image used above but the rendered HTML does. This manner if the tourist’s browser doesn’t render JavaScript, they may not be seeing the entirety you display to your website online.

From a credibility point of view, that’s a loss.

How can a tourist see your website as credible and authoritative if they can’t put a face to a call? The identical may be said for imagery and symbols that your internet site presentations someplace else, like at checkout.

Overall, the above troubles aren't causing troubles for web page rendering. So even as a few on-page elements or data may not be to be had to Google crawlbots in the uncooked HTML, they'll get them in the rendered HTML.

One important issue that’s now not particular to Zoom is a internet site blocking off .Js documents inside the robots.Txt file. This can save you Google crawlbots from crawling, rendering, and indexing those files which could be destructive for your SEO ranking. 

Here’s a list of all the JavaScript URLs with blocked resources on Zoom:

Javascript URLs blocked on zoom. 

If this isn’t corrected, it may have most important affects on scores.

Brand #2: Asana

The 2d SaaS emblem we tested changed into Asana, a work and assignment management platform.

Like Zoom, Asana leverages JavaScript throughout their website. We see quite a few the same troubles on Asana as on Zoom, which include differing page titles on raw HTML versus rendered HTML.

This isn’t a prime problem, assuming there is nothing blocking off the pages from rendering as they ought to.

However, much like with Zoom, Asana does have numerous pages with blocked JavaScript assets:

Asana blocked javascript. 

The suitable news is that that is an clean fix. The robots.Txt report simply desires to be up to date to ensure that no vital aid documents (i.E. JavaScript) are being blocked. Once the blocks are eliminated, the documents may be rendered to each net customers (i.E. Person browsers) and Google crawlbots.

Don’t want to attend the weeks or months it could take for Google to recrawl your web page?

Once you’ve unblocked your JavaScript documents, you can ask Google to recrawl your URLs. This will ensure your formerly non-listed or poorly indexed pages are recrawled, rerendered, and reindexed for SERPs.

Brand #three: Neil Patel

I couldn’t probably analyze SaaS websites that use JavaScript without throwing my very own website online, neilpatel.Com, into the mix!

Similar to Zoom and Asana, we see some of attributes (e.G. Hreflang, content) displayed inside the rendered HTML but not in the raw HTML:

Neil Patel Raw vs. Rendered HTML. 

The content is nicely loaded, so these are unlikely to be impacting Google crawlability. However, if the rendered HTML did now not display the content due to blocked JavaScript documents, for example, then Google might be missing (i.E. Now not indexing) important content material.

Speaking of blocked JavaScript documents, even though, Neil Patel best has 3 URLs impacted by way of the commonplace issue:

URLs impacted by an trouble on Neil Patel's website. 

This is something we noticed across all 3 manufacturers to various levels, even though Neil Patel does a notable process of minimizing the threat by reducing the number of blocked JavaScript documents.

My group did find one trouble that we’re operating quick to solve, and that’s making sure our JavaScript hyperlinks render efficaciously.

What are JavaScript links?

These are hyperlinks created in JavaScript, both rather than or further to, in HTML.

If the JavaScript hyperlinks don’t render, then the internal hyperlink fine and web page authority will now not be exceeded to the centered URL. After all, if the link can’t render then Google can’t crawl!

Common Javascript Rendering Issues and How to Address Them

We have tested 3 popular SaaS web sites and feature across a few JavaScript rendering problems. So what are the most commonplace of these troubles and how can you deal with them?

Common Javascript Rendering issues, 

Blocked .Js Files in Your robots.Txt File

If I had to pick just one JavaScript rendering difficulty to focus on, it would be blocked JavaScript assets inside the robots.Txt document.

Why?

A blocked JavaScript resource is one which has no risk of rendering, whether or not for the person or Google crawlbots. While there can be motives to block some resources within the robots.Txt record, it’s something you should keep away from on every occasion possible. 

The other purpose I like to name attention to this JavaScript rendering difficulty is as it’s such an easy restore!

You or your website administrator clearly need to replace the robots.Txt document to cast off aid blocks. This just takes a bit bit of know-how of robots.Txt documents. Once finished, you can ask Google to recrawl your URLs.

Conflicting Directives

There are some methods to directly talk with seek engine crawlbots on your HTML code. These are known as directives, and a few famous examples of them are the “noindex” and “nofollow” tag attributes.

The noindex directive tells crawlbots no longer to index the page, even as the nofollow directive tells crawlbots not to bypass link juice from the current URL to the linked URL.

A common JavaScript rendering difficulty is conflicting directives. This means that the uncooked HTML contains one or greater directives that the rendered HTML doesn’t. We saw this on Zoom, as proven within the image underneath:

Conflicting directives Javascript HTML. 

When this occurs, neither the non-rendered page nor the rendered JavaScript page can be indexed. It can also cause a timeout mistakes, which is possibly to appear in any internet site performance reports you run.

Fortunately, the repair for that is additionally simple.

If you want to ensure that your page is noindexed without creating a JavaScript timeout error, then ensure the noindex directive is blanketed within the rendered HTML as well. If rather you wish the web page to be indexed, then make sure the directive is removed from both the uncooked HTML and rendered HTML.

Non-Renderable JavaScript Links

Just like JavaScript documents might not usually render, the equal can be said of JavaScript hyperlinks.

These hyperlinks may have many functions, though maximum of them name to related JavaScript files (e.G topic files) or plugins.

It’s now not unusual for documents to be deleted or plugins to be deactivated over the lifetime of your website. So because of this, you very possibly have non-renderable JavaScript hyperlinks.

In many cases, like most JS rendering mistakes, those won’t have an effect on normal website overall performance. However, you should know which hyperlinks are non-renderable and do away with them on a everyday basis to keep away from script bloat.

FAQs

What is server-side rendering?

Server-aspect rendering is JavaScript rendering that occurs at the internet site server. The raw HTML is converted into rendered HTML before it’s despatched to the consumer (e.G. Consumer browser). This is the opposite of client-facet rendering, in which uncooked HTML is despatched to the client after which converted into rendered HTML. 

How does server-aspect rendering paintings?

With server-side rendering, the patron contacts the server via an HTTP connection. The server then fetches required data (either from the database or third parties) and creates a rendered HTML record which it then sends to the client. This way the statistics being despatched from server to c

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