Tools & Wizards About Us

Report Summary

  • 53

    Performance

    Renders faster than
    70% of other websites

  • 83

    Accessibility

    Visual factors better than
    that of 54% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 87

    SEO

    Google-friendlier than
    65% of websites

chem4kids.com

Rader's CHEM4KIDS.COM - Chemistry basics for everyone!

Page Load Speed

613 ms in total

First Response

123 ms

Resources Loaded

353 ms

Page Rendered

137 ms

About Website

Visit chem4kids.com now to see the best up-to-date CHEM4KIDS content for United States and also check out these interesting facts you probably never knew about chem4kids.com

Chem4Kids.com! The site that teaches the basics of chemistry to everyone! Tutorials on matter, atoms, elements, the periodic table, reactions, and biochemistry.

Visit chem4kids.com

Key Findings

We analyzed Chem4kids.com page load time and found that the first response time was 123 ms and then it took 490 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 10% of websites can load faster.

Performance Metrics

chem4kids.com performance score

53

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value0.9 s

100/100

10%

LCP (Largest Contentful Paint)

Value1.4 s

100/100

25%

SI (Speed Index)

Value5.0 s

63/100

10%

TBT (Total Blocking Time)

Value2,940 ms

3/100

30%

CLS (Cumulative Layout Shift)

Value0.223

56/100

15%

TTI (Time to Interactive)

Value10.4 s

24/100

10%

Network Requests Diagram

chem4kids.com

123 ms

chemistry-home.css

34 ms

adsbygoogle.js

117 ms

brand

22 ms

brandjs.js

32 ms

Our browser made a total of 16 requests to load all elements on the main page. We found that 56% of them (9 requests) were addressed to the original Chem4kids.com, 13% (2 requests) were made to Google.com and 13% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (123 ms) belongs to the original domain Chem4kids.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 14.5 kB (8%)

Content Size

182.2 kB

After Optimization

167.7 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Chem4kids.com main page is 182.2 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. Only 5% of websites need less resources to load. Javascripts take 92.0 kB which makes up the majority of the site volume.

HTML Optimization

-73%

Potential reduce by 14.0 kB

  • Original 19.1 kB
  • After minification 17.3 kB
  • After compression 5.1 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 14.0 kB or 73% of the original size.

Image Optimization

-0%

Potential reduce by 83 B

  • Original 70.0 kB
  • After minification 69.9 kB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. CHEM4KIDS images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 215 B

  • Original 92.0 kB
  • After minification 92.0 kB
  • After compression 91.8 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. This website has mostly compressed JavaScripts.

CSS Optimization

-19%

Potential reduce by 218 B

  • Original 1.2 kB
  • After minification 1.2 kB
  • After compression 943 B

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Chem4kids.com needs all CSS files to be minified and compressed as it can save up to 218 B or 19% of the original size.

Requests Breakdown

Number of requests can be reduced by 3 (21%)

Requests Now

14

After Optimization

11

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 14 CSS, Javascripts, AJAX and image requests in order to completely render the main page of CHEM4KIDS. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 4 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

chem4kids.com accessibility score

83

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

Names and labels

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

Form elements do not have associated labels

Best Practices

chem4kids.com best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

General

Impact

Issue

High

Page has valid source maps

SEO Factors

chem4kids.com SEO score

87

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Links are not crawlable

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Chem4kids.com can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Chem4kids.com main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

Open Graph description is not detected on the main page of CHEM4KIDS. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: