Tools & Wizards About Us
ofcourse.kr screenshot

Report Summary

  • 70

    Performance

    Renders faster than
    81% of other websites

  • 67

    Accessibility

    Visual factors better than
    that of 32% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 100

    SEO

    Google-friendlier than
    95% of websites

ofcourse.kr

ofcourse

Page Load Speed

873 ms in total

First Response

34 ms

Resources Loaded

606 ms

Page Rendered

233 ms

ofcourse.kr screenshot

About Website

Click here to check amazing Ofcourse content for South Korea. Otherwise, check out these important facts you probably never knew about ofcourse.kr

웹 개발에 꼭 필요한 정보만 모아두었어요. 간단하게 HTML, CSS 및 JavaScript를 배우세요.

Visit ofcourse.kr

Key Findings

We analyzed Ofcourse.kr page load time and found that the first response time was 34 ms and then it took 839 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 15% of websites can load faster.

Performance Metrics

ofcourse.kr performance score

70

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.5 s

68/100

10%

LCP (Largest Contentful Paint)

Value3.3 s

70/100

25%

SI (Speed Index)

Value2.5 s

98/100

10%

TBT (Total Blocking Time)

Value670 ms

44/100

30%

CLS (Cumulative Layout Shift)

Value0.001

100/100

15%

TTI (Time to Interactive)

Value5.2 s

74/100

10%

Network Requests Diagram

ofcourse.kr

34 ms

ofcourse.kr

89 ms

font-awesome.min.css

38 ms

css

95 ms

global.css

10 ms

Our browser made a total of 15 requests to load all elements on the main page. We found that 40% of them (6 requests) were addressed to the original Ofcourse.kr, 20% (3 requests) were made to Fonts.gstatic.com and 13% (2 requests) were made to Maxcdn.bootstrapcdn.com. The less responsive or slowest element that took the longest time to load (163 ms) relates to the external source Google-analytics.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.6 kB (7%)

Content Size

24.2 kB

After Optimization

22.6 kB

  • HTML
  • JavaScript

In fact, the total size of Ofcourse.kr main page is 24.2 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. 25% of websites need less resources to load. Javascripts take 21.0 kB which makes up the majority of the site volume.

HTML Optimization

-49%

Potential reduce by 1.6 kB

  • Original 3.2 kB
  • After minification 3.2 kB
  • After compression 1.7 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 1.6 kB or 49% of the original size.

JavaScript Optimization

-0%

Potential reduce by 50 B

  • Original 21.0 kB
  • After minification 21.0 kB
  • After compression 20.9 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.

Requests Breakdown

Number of requests can be reduced by 3 (33%)

Requests Now

9

After Optimization

6

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 9 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Ofcourse. 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 CSS and as a result speed up the page load time.

Network Requests Diagram

ofcourse.kr

ofcourse.kr

34 ms

ofcourse.kr

ofcourse.kr

89 ms

font-awesome.min.css

font-awesome.min.css

38 ms

css

css

95 ms

global.css

global.css

10 ms

jquery.min.js

jquery.min.js

67 ms

home.css

home.css

18 ms

logo.png

logo.png

161 ms

analytics.js

analytics.js

163 ms

learn_simply.png

learn_simply.png

57 ms

PbykFmXiEBPT4ITbgNA5CgmG0X7u.otf

PbykFmXiEBPT4ITbgNA5CgmG0X7u.otf

83 ms

Pby7FmXiEBPT4ITbgNA5CgmOIl3477IS.otf

Pby7FmXiEBPT4ITbgNA5CgmOIl3477IS.otf

87 ms

Pby7FmXiEBPT4ITbgNA5CgmOalv477IS.otf

Pby7FmXiEBPT4ITbgNA5CgmOalv477IS.otf

90 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

54 ms

collect

collect

95 ms

Accessibility Review

ofcourse.kr accessibility score

67

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

Links do not have a discernible name

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

High

List items (<li>) are not contained within <ul> or <ol> parent elements.

Best Practices

ofcourse.kr 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

SEO Factors

ofcourse.kr SEO score

100

Search Engine Optimization Advices

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

Language and Encoding

  • Language Detected

    KO

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Ofcourse.kr can be misinterpreted by Google and other search engines. Our service has detected that Korean 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 Ofcourse.kr 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

ofcourse.kr

Open Graph description is not detected on the main page of Ofcourse. 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: