Report Summary

  • 44

    Performance

    Renders faster than
    63% of other websites

  • 68

    Accessibility

    Visual factors better than
    that of 33% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 78

    SEO

    Google-friendlier than
    39% of websites

learn-c.org

Learn C - Free Interactive C Tutorial

Page Load Speed

1.5 sec in total

First Response

64 ms

Resources Loaded

1.3 sec

Page Rendered

151 ms

learn-c.org screenshot

About Website

Click here to check amazing Learn C content for United States. Otherwise, check out these important facts you probably never knew about learn-c.org

learn-c.org is a free interactive C tutorial for people who want to learn C, fast.

Visit learn-c.org

Key Findings

We analyzed Learn-c.org page load time and found that the first response time was 64 ms and then it took 1.5 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 30% of websites can load faster.

Performance Metrics

learn-c.org performance score

44

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.4 s

97/100

10%

LCP (Largest Contentful Paint)

Value2.0 s

97/100

25%

SI (Speed Index)

Value6.2 s

43/100

10%

TBT (Total Blocking Time)

Value3,630 ms

1/100

30%

CLS (Cumulative Layout Shift)

Value0.419

23/100

15%

TTI (Time to Interactive)

Value11.1 s

20/100

10%

Network Requests Diagram

learn-c.org

64 ms

codemirror.css

9 ms

monokai.css

15 ms

bootstrap.min.css

32 ms

bootstrap-responsive.css

28 ms

Our browser made a total of 79 requests to load all elements on the main page. We found that 34% of them (27 requests) were addressed to the original Learn-c.org, 9% (7 requests) were made to Apis.google.com and 6% (5 requests) were made to Tpc.googlesyndication.com. The less responsive or slowest element that took the longest time to load (583 ms) relates to the external source Spoj.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 679.4 kB (62%)

Content Size

1.1 MB

After Optimization

416.6 kB

In fact, the total size of Learn-c.org main page is 1.1 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 70% of websites need less resources to load. Javascripts take 980.3 kB which makes up the majority of the site volume.

HTML Optimization

-71%

Potential reduce by 57.9 kB

  • Original 81.2 kB
  • After minification 81.1 kB
  • After compression 23.3 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 57.9 kB or 71% of the original size.

Image Optimization

-10%

Potential reduce by 3.6 kB

  • Original 34.5 kB
  • After minification 30.9 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. Learn C images are well optimized though.

JavaScript Optimization

-63%

Potential reduce by 617.9 kB

  • Original 980.3 kB
  • After minification 979.9 kB
  • After compression 362.4 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 617.9 kB or 63% of the original size.

Requests Breakdown

Number of requests can be reduced by 54 (70%)

Requests Now

77

After Optimization

23

The browser has sent 77 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Learn C. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 42 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

learn-c.org accessibility score

68

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

[aria-*] attributes do not match their roles

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

Buttons do not have an accessible name

High

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Best Practices

learn-c.org best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

learn-c.org SEO score

78

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Links do not have descriptive text

High

Image elements do not have [alt] attributes

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 Learn-c.org 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 Learn-c.org 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 Learn C. 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: