955 ms in total
240 ms
632 ms
83 ms
Click here to check amazing Java Script content for China. Otherwise, check out these important facts you probably never knew about javascript.info
Modern JavaScript Tutorial: simple, but detailed explanations with examples and tasks, including: closures, document and events, object oriented programming and more.
Visit javascript.infoWe analyzed Javascript.info page load time and found that the first response time was 240 ms and then it took 715 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.
javascript.info performance score
name
value
score
weighting
Value2.3 s
74/100
10%
Value3.2 s
72/100
25%
Value4.5 s
72/100
10%
Value3,460 ms
2/100
30%
Value0
100/100
15%
Value6.5 s
59/100
10%
240 ms
19 ms
19 ms
18 ms
17 ms
Our browser made a total of 34 requests to load all elements on the main page. We found that 94% of them (32 requests) were addressed to the original Javascript.info, 6% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (338 ms) belongs to the original domain Javascript.info.
Page size can be reduced by 58.0 kB (62%)
93.4 kB
35.4 kB
In fact, the total size of Javascript.info main page is 93.4 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. 20% of websites need less resources to load. CSS take 42.4 kB which makes up the majority of the site volume.
Potential reduce by 27.5 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 27.5 kB or 81% of the original size.
Potential reduce by 34 B
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.
Potential reduce by 30.5 kB
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. Javascript.info needs all CSS files to be minified and compressed as it can save up to 30.5 kB or 72% of the original size.
Number of requests can be reduced by 28 (85%)
33
5
The browser has sent 33 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Java Script. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 14 to 1 for JavaScripts and from 16 to 1 for CSS and as a result speed up the page load time.
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javascript.info accessibility score
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
Buttons do not have an accessible name
Links do not have a discernible name
<object> elements do not have alternate text
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
javascript.info best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
Page has valid source maps
javascript.info SEO score
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
Document uses legible font sizes
Tap targets are not sized appropriately
EN
EN
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Javascript.info can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Javascript.info 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.
{{og_description}}
javascript.info
Open Graph description is not detected on the main page of Java Script. 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: