If you want to be a web designer, then you must learn Javascript with HTML, CSS, because Javascript is very useful for any website.

Today, in this article, you will know what the javascript is, what benefits can it be by learning and what can be done with it.

What is javascript? What is JavaScript in Hindi?
What are the differences between HTML, CSS and Javascript?
What are the uses of JavaScript?
What tools are needed for JavaScript?
Benefits of javascript
Disadvantages of JavaScript

What is JavaScript?

JavaScript is a powerful scripting language that can be added with HTML to make the webpage more interactive.
Javascript was created by Brendan Eich in Netscape in 1995 when it was named Livescript, which was later changed to JavaScript.
Many programmers consider Javascript and Java related to each other, but in reality these two are completely different from each other and there is no connection between them. Where Java is a very complex programming language, Javascript is only a light-weighted scripting language.
Javascript is a client side scripting, which means it runs on the user’s browser.
Whenever the user sends a request for a webpage, then the server also sends the JavaScript code with the HTML of the page to the browser, now it is the responsibility of the browser to execute the code of that javascript when needed.
You can see the javascript code on your browser because it runs on the browser.
On the contrary, you might have heard of server side programming like PHP, ASP.Net, JSP etc. All of these languages ​​are created on the program browser but not run on the server and its output is converted to HTML and appears in the browser and its code You can not see on the browser.

What are the differences between HTML, CSS and Javascript?

Many people live in quite confusion before learning the javascript and there are certain questions in their mind such as:

What is the difference between HTML, CSS and Javascript?
Can not we create a website without Javascript?
Do we have to learn these three?
All these questions can be answered only when we know what is the work of these three people. So let’s understand the use of these three:
HTML: This is the structure of the web page. Read: Learn HTML in just 20 minutes
CSS: Cascading Style Sheets is designed with part of the website’s presentation, color is filled in it. Read: Complete CSS tutorial in Hindi
Javascript: Page is created interactive, some logic like user click on a button, which function will execute and which task will be done etc. Read: JavaScript Tutorial in Hindi – Learn Basic Javascript in just 20 minutes in Hindi

All this means that you can create a website from HTML and CSS, but if you want to add some interactive features to it, then you have to use Javascript in this way.

What are the uses of JavaScript?

It is used to create an interactive website. Most of its usage would be to perform a task like this:

Form Validation: While taking input on a form by the user, verify that the data entered is in the correct format or not like email, mobile no. Etc.
Popup Windows: such as alert dialog box, confirm dialog box etc. can also be created from javascript.
Drop Down Menu: The dynamic drop down menu can be created for the website.
Browser Detection: User can find out which browser is using.
Cookies: Some information can be stored in the user’s browser and when the user visits again, this information can be accessed.

What tools are needed for JavaScript?

To coding Javascript and running it does not require any special tools, only two things should be in your system:

Code Editor: You can use the notepad like a normal text editor to write code, or you can use any code editor such as Notepad ++, Dreamweaver, Sublime, Brackets etc.
Browser: You can use an advanced web browser such as Chrome, Firefox, Safari etc.

Benefits of javascript

Fast Execution: This is fast because it runs on the client side and does not require much server interaction.
Cross Platform: It can work easily on any operating system and any modern browser like Chrome, Firefox, Internet Explorer etc.
Easy to Learn: This language is very simple and it is very easy to learn.

Disadvantages of JavaScript

Security Issues: As you know it is executable on the client’s browser, it is not much secure, although keeping some security in view, some restrictions have been set in JavaScript, such as it does not read or write the files of the user’s system. Can do it Despite these restrictions, some malicious codes may still run.
Javascript rendering varies: This can work differently on different browsers i.e. its outputs are not consistent on platforms yet.

Today you read in this article what is JavaScript, what are its work, and hopefully you will find some basic information about it. You can also subscribe to our newsletter by submitting your email in the subscribe box below.

Do you want to fix the render-blocking JavaScript & CSS error in the WordPress website? If you have tested your own website in Google PageSpeed ​​Insights, then you may have been suggested to fix the render-blocking scrips and CSS error.

So we will tell you in this article how to easily fix the render blocking javascript & css in WordPress to improve the Google PageSpeed ​​Insights Score of the website.

What is Render-Blocking JavaScript & CSS?

Every WordPress site has its own theme and plugins, which attach to the front-end of your website via javascript and CSS files.

This script can increase the load time of your site’s page, but it can also block the rendering of the page.

Before loading the rest of the page, your site visitor’s browser must load scripts and CSS. This means that if your website’s visitor’s internet connection is slow, then your visitor may have to wait more than a milliseconds to see the page of the site.

These scripts and stylesheets are known as render-blocking JavaScript & CSS. But if you want to score 100 in your website’s Google PageSpeed, then you also have to fix this error. Because PageSpeed ​​of our website is also very important for SEO.

What is Google PageSpeed ​​Score?

Google PageSpeed ​​Insights is an online optimization tool, which Google has created to optimize and test the website. Through this website you can easily optimize and test your website.

This tool tells you the error of your website, along with it also suggests to fix those errors. So that your site’s page load time can be improved even further.

This tells the performance of your site through the score of the number. Most website scores can range from 50 to 80. And any website can also be below 50. However some website owners have also got 100 scores. Because if you try even a little bit then you can get 100 score easily.

Do Your Website Need a “100” Google PageSpeed ​​Score?

The goal of Google PageSpeed ​​Insights is to suggest that you improve your website’s speed and performance.

Remember that speed and performance are also part of SEO. Because speed and performance are also important for your site rank. This can improve the user experience of your site.

Speed ​​is very important for a better user experience. More recently, we’ve made the speed of our site even better. So this has given us very pleasant results too.

That’s why we recommend that you also keep in mind the speed of your website. So that the site is easy to rank.

So let’s see how we can fix javascript & CSS blocking render in WordPress. For this, we will talk about two methods. Through which we fix the render blocking javascript and CSS into WordPress.

You can select one of the two best practices for your website, because you can fix javascript & CSS render blocking by both method.

1. Fix Render-Blocking Scripts & CSS by Autoptimize
It is very easy to fix Render Blocking Scripts & CSS through this method. So we recommend all users to use this method. But you have to first install and activate the Autoptimize plugin in your WordPress.

After the plugin is activated, after that you have to configure the plugin setting. For this, go to Settings »Autoptimize in the WordPress admin area.
You will now see JavaScript options and CSS options on this page. You have to select these options. After that you have to click on the save changes button.

Now, you can now test your website using Google PageSpeed ​​Tool. If still the error of rendering blocking scripts is coming, then you will have to go to the plugin’s setting page again. And there you have to click on the button of Show Advanced Settings at the top of the page.
Now in the JavaScript options of this plugin, you also have the addition of aggregate inline JS? Have to choose. After this you have to remove seal.js or jquery.js from Exclude scripts from Autoptimize option.

Next, you now come to CSS Options. And also select the aggregate inline CSS.
Now you can click on the Save changes and Empty Cache button. When you complete this process, you can test your website in Google PageSpeed ​​Tool. And see if there is no new error by optimizing JavaScripts and CSS.

how does it work?

Autoptimize, quits all the files in JavaScript and CSS. After that, it creates minified CSS and JavaScripts files. And async and suspend cached copies on the website.

render-blocking fixes the problem of javascript & css error. However, please keep in mind that it can also affect your website’s performance or appearance.

2. Fix Render-Blocking JavaScript & CSS via W3 Total Cache
This method requires a little more work to fix the render-blocking JavaScript & CSS error. For this we recommend that you use the W3 Total Cache plugin.

First of all, you have to install and activate the W3 Total Cache plugin in your WordPress. After this you will need to go to the Minify section of the Performance »General Settings page in the plugin.
First you have to ‘Enable’ the Minify option. Now you have to select the minify mode option.

Now you have to save the setting by clicking on save all settings.

Next, you have to add scripts and CSS, which you want to minify. For this, you have to copy the URL of scripts and stylesheets in the ‘Eliminate render-blocking javascript and CSS in above-the-fold content’ in the Google PageSpeed ​​Insights tool.
In the PageSpeed ​​Insights tool, click on ‘Show how to fix’ in ‘Eliminate render-blocking javascript and CSS in above-the-fold content’. Here you will find more lists of scripts and stylesheets, which you have to fix.

Now take your mouse over the script. By doing this the full URL of the script will be displayed. As mentioned above in the picture. Now you have to copy it to your keyboard’s CTRL + C (Command + C on Mac).

How to Add Scripts and Stylesheets

Now go to the Performance »Minify page of your WordPress plugin.

First of all, the JavaScript files we want to add, which we want to minified For this, we have to go to the JS section. And it has to be enabled. Now after this, in the ‘Operations in areas’ select minify from the <head> section. Now after this, you set the ‘Non-blocking async’ in the embed type.
Next, you will click on the ‘Add Script’ button. Then the script URL we copied in the Google PageSpeed ​​tool. He will add it here.

Now after this we have to add stylesheet to the CSS section. For this you have to go back to the Google PageSpeed ​​tool. And from there Eliminate render-blocking javascript and CSS in above-the-fold content, click on ‘show how to fix’ and copy the css URL.

Now go to Performance »Minify page of the W3 Total Cache plugin. And by clicking on the ‘Add a stylheet’ button in the CSS section, add the URL copied from the Google PageSpeed ​​tool.
Finally, you can save by clicking on the ‘Save settings and purge cache’ button. Go to Google PageSpeed ​​Tool and test again on website. And make sure the website is working well, and not Eliminate render-blocking JavaScript & CSS error has not been fixed.

Troubleshooting Problems
Eliminate render-blocking JavaScript & CSS fix Depending on your plugin and WordPress themes, it uses JavaScript and CSS. Because each WordPress theme uses JavaScript & CSS separately. So fixing all render-blocking javascript & css may be a little challenging.

The tools given above can help you in this. Because these plugins may require some different scripts to work properly. All of this solution may be that plugins can break. Or can behave differently.

Google optimizi on your site