Report Summary

  • 94

    Performance

    Renders faster than
    93% of other websites

  • 89

    Accessibility

    Visual factors better than
    that of 73% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    82% of websites

  • 98

    SEO

    Google-friendlier than
    92% of websites

d3js.org

D3.js - Data-Driven Documents

Page Load Speed

663 ms in total

First Response

50 ms

Resources Loaded

206 ms

Page Rendered

407 ms

d3js.org screenshot

About Website

Visit d3js.org now to see the best up-to-date D3 Js content for China and also check out these interesting facts you probably never knew about d3js.org

D3 is a JavaScript library for visualizing data with HTML, SVG, and CSS.

Visit d3js.org

Key Findings

We analyzed D3js.org page load time and found that the first response time was 50 ms and then it took 613 ms to load all DOM resources and completely render a web page. This is an excellent result, as only 5% of websites can load faster.

Performance Metrics

d3js.org performance score

94

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.1 s

99/100

10%

LCP (Largest Contentful Paint)

Value1.9 s

97/100

25%

SI (Speed Index)

Value1.6 s

100/100

10%

TBT (Total Blocking Time)

Value260 ms

83/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value2.7 s

97/100

10%

Network Requests Diagram

d3js.org

50 ms

d3.v3.min.js

7 ms

analytics.js

68 ms

forkme.png

55 ms

ex.jpg

45 ms

Our browser made a total of 6 requests to load all elements on the main page. We found that 67% of them (4 requests) were addressed to the original D3js.org, 33% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (68 ms) relates to the external source Google-analytics.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 77.1 kB (12%)

Content Size

668.3 kB

After Optimization

591.1 kB

In fact, the total size of D3js.org main page is 668.3 kB. This result falls within a vast category (top 1 000 000) of heavyweight, probably not optimized, and thus slow loading web pages. Only a small number of websites need less resources to load. Images take 551.6 kB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 76.5 kB

  • Original 96.8 kB
  • After minification 96.6 kB
  • After compression 20.3 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 76.5 kB or 79% of the original size.

Image Optimization

-0%

Potential reduce by 590 B

  • Original 551.6 kB
  • After minification 551.0 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. D3 Js images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 59 B

  • Original 19.8 kB
  • After minification 19.8 kB
  • After compression 19.8 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.

Requests Breakdown

We found no issues to fix!

Requests Now

5

After Optimization

5

The browser has sent 5 CSS, Javascripts, AJAX and image requests in order to completely render the main page of D3 Js. According to our analytics all requests are already optimized.

Accessibility Review

d3js.org accessibility score

89

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

Best Practices

d3js.org best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

d3js.org SEO score

98

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

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 D3js.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 D3js.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 data is detected on the main page of D3 Js. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: