The Basics of Javascript Guide for SEO

Javascript Guide

Written by Jeremy Earle, JD

July 5, 2022

You’ll learn the most important phrases and ideas in this article.

Getting your head around JavaScript may be quite the challenge.

However, JavaScript is growing more and more popular on the websites that we administer, therefore it’s more necessary than ever to grasp it.

The use of JavaScript on the contemporary web is on the increase.

SEO experts may wish for a time when websites were static and programmed just in HTML and CSS.. However, engaging websites often need the use of JavaScript’s built-in interactivity.

According to Google Webmaster Trends Analyst John Mueller, “isn’t going away.”

We should get more familiar with this programming language since it is all around us. Rather than dreading JavaScript, let’s use the opportunity to learn more about it.

A common misperception is that JavaScript is just for programmers to deal with.

In my opinion, it’s not the case, since everyone who wants consumers and search engines to be able to access their website’s content would be affected by this.

Don’t worry if you’ve never heard of JavaScript or have no clue what it is or does.

As a starting point, I’ve put up a dictionary of the most important phrases and topics you should know.

What Does JavaScript Mean?

It’s possible to create dynamic components and interactive features on a website using JavaScript, a computer language.

When HTML and CSS are digested and produced, JavaScript is run.

The Document Object Model (DOM) will be changed, and the JavaScript will be displayed in the browser when the events or variables specified in the JavaScript have been triggered.

The HTML and CSS frequently serve as a basis for a page’s design, while JavaScript is used to make any last adjustments.

What Is the Document Object Model, or DOM, Anyway?

When a page is loaded, the Document Object Model (DOM) is formed and contains nodes and objects that represent the various components and properties of the page.

The page’s structure, content, and style are laid out so that other applications may edit and manipulate the page.

A language like JavaScript may modify the DOM components of a page.

What is ECMAScript?

In order to ensure that JavaScript code is used consistently, ECMAScript (ES) was developed.

When the ECMAScript language is upgraded and adjusted, new editions are issued, such as ES5 and ES6 (which is also referred to as ES2015).

To put it another way, what is transpiration?

Programming languages may be transformed using a transpiler, which is a kind of compiler. Like Google Translate for code, the principle is similar.

For example, you can convert JavaScript to C++ or Python to Ruby using a language converter.

If you’re utilising JavaScript rendering, a transpiler was formerly advised to use when Google was using an older version of Chrome for rendering that didn’t support the current ECMAScript, ES6.

Chromium: What Is It?

Google employs a web rendering service (WRS) for rendering pages for sites that need JavaScript to run.

Google employs Chromium, an open-source project whose code forms the core of the Chrome browser, in order to accomplish this goal.

New versions of Chrome are launched as soon as a new version of the browser is available. Since Chrome 41 was launched in 2015, Googlebot has utilized a WRS based on Chrome 41.

It was just a matter of time until Google made their WRS evergreen, meaning it would be updated whenever Chrome was upgraded.

What is a Single-Page Application?

Single-page applications (SPA) dynamically update and re-render a page in response to user input, rather than requesting fresh HTML and content from the server each time the user wants it.

It is possible to employ JavaScript frameworks to support the dynamically changing components of SPAs.

Angular, Polymer, React, and Vue: What Do They Mean?

There are several JavaScript frameworks to choose from.

  • Google created Angular and Polymer.
  • Facebook created React.

Evan You, a former member of Google’s Angular team, created Vue.

Developers will choose the JavaScript framework that best meets their needs and those of the project they’re working on since each has advantages and disadvantages.

If you’re curious in how the various frameworks stack up, check out this tutorial.

Rendering in JavaScript: What Is It?

It takes the script and all the instructions it contains, processes it, and runs it in the browser to provide the desired result.

Controlling the rendering of JavaScript may be done in a variety of ways.

Both of these areas may be adversely affected by forcing JavaScript to be shown on a website

  • Quickness of the website
  • Indexing and crawling by search engines

Using different rendering methods, you can minimize website load time and ensure that information is crawlable and indexed by search engines.


Prior to rendering, the material on the website is rendered, so that the user or search engine is presented with the page as a static document with all of its information.

A search engine or user’s browser will not have to display the page if it is preloaded in this manner, allowing your content to be easily available.

Pre-rendering is more often employed by search engine bots than humans. Static pages are less appealing to consumers since they don’t have any dynamic material or interaction.

Representational State Transfer

So that JavaScript may be handled before it is requested by the user’s browser or a search engine crawler.

This technique speeds up page loading by reducing the amount of JavaScript processing required on the user’s device.

In addition, server-side rendering guarantees that search engines can index all of the page’s content.

Rendering on the Client Side

The user’s browser or the search engine that’s requesting a page processes JavaScript during client-side rendering.

The user’s device or a search engine’s responsibility is to process and produce a page once the server handles the first request.

Using client-side rendering is generally discouraged because of the latency between Google indexing a website and rendering it.

According to Google, pages that need to be rendered are placed in a queue and will be processed as soon as sufficient resources are available.

Up to one week might pass before your page is included in the search engine’s crawling if you’re depending on Google to display it client-side.

Stylistic Rendering

When a website is requested by a search engine bot or a user’s browser, dynamic rendering uses a separate set of rendering algorithms.

A tiny client-side renderer (for example, Puppeteer or Rendertron) is used to pre-rendered a page so that Googlebot may view and index it as soon as it arrives.

Computer-Aided Design

Server-side and client-side rendering are combined in hybrid rendering.

When a user’s browser or a search engine crawler requests material, it is pre-rendered server-side and provided to the client.

JavaScript is displayed client-side after the first-page load to enable any interaction.


The information in this tutorial should have been helpful to you in understanding the fundamentals of JavaScript and how it affects websites.

You should now be able to converse with the developers more confidently now that you better understand the terminology they use!

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