Access ocw.nthu.edu.tw. 國立清華大學開放式課程OpenCourseWare(NTHU, OCW)

name

value

score

weighting

FCP (First Contentful Paint)

Value12.2 s

0/100

10%

LCP (Largest Contentful Paint)

Value27.7 s

0/100

25%

SI (Speed Index)

Value23.0 s

0/100

10%

TBT (Total Blocking Time)

Value570 ms

52/100

30%

CLS (Cumulative Layout Shift)

Value0.296

41/100

15%

TTI (Time to Interactive)

Value24.4 s

1/100

10%

ocw.nthu.edu.tw

2507 ms

Our browser made a total of 1 request to load all elements on the main page. We found that all of those requests were addressed to Ocw.nthu.edu.tw and no external sources were called. The less responsive or slowest element that took the longest time to load (2.5 sec) belongs to the original domain Ocw.nthu.edu.tw.

Content Size

94 B

After Optimization

84 B

In fact, the total size of Ocw.nthu.edu.tw main page is 94 B. This result falls within the top 5000 of lightweight and thus fast loading web pages. Only a small number of websites need less resources to load. HTML takes 94 B which makes up the majority of the site volume.

HTML Optimization

-11%

Potential reduce by 10 B

Original 94 B
After minification 91 B
After compression 84 B

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 10 B or 11% of the original size.

Requests Now

After Optimization

Besides the initial HTML request, no CSS, Javascripts, AJAX or image files were requested in the course of web page rendering.

Accessibility Issues

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.

High

Buttons do not have an accessible name

High

Links do not have a discernible name

These are opportunities to improve the legibility of your content.

High

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

These are opportunities to improve keyboard navigation in your application.

High

[id] attributes on active, focusable elements are not unique

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

High

<html> element does not have a valid value for its [lang] attribute.

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

Low

Detected JavaScript libraries

Search Engine Optimization Advices

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

High

Links are not crawlable

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/).

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

Language Detected

JA
Language Claimed

N/A
Encoding

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Ocw.nthu.edu.tw can be misinterpreted by Google and other search engines. Our service has detected that Japanese 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 Ocw.nthu.edu.tw 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

ocw.nthu.edu.tw

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