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14 webb.nasa.gov Last Updated: 4 months

Success 47% of passed verification steps
Warning 23% of total warning
Errors 30% of total errors, require fast action
Share

Desktop

Mobile

Performance Desktop Score 87%
Best Practices Desktop Score 100%
SEO Desktop Score 91%
PWA Desktop Score 22%
Performance Mobile Score 67%
Best Practices Mobile Score 100%
SEO Mobile Score 88%
PWA Mobile Score 30%
Page Authority Authority 0%
Domain Authority Domain Authority 0%
Moz Rank 0.0/10
Bounce Rate Rate 0%
Charset Encoding
Great, language/character encoding is specified: UTF-8
Title Tag 31 Characters
WEBB SPACE TELESCOPE GSFC/NASA
Meta Description 350 Characters
The Latest NASA Released Webb Image is featured on this page. The James Webb Space Telescope's revolutionary technology will study every phase of cosmic history—from within our solar system to the most distant observable galaxies in the early universe. Webb’s infrared telescope will explore a wide range of science questions to help us understand th
Effective URL 21 Characters
https://webb.nasa.gov
Excerpt Page content
Webb Space Telescope GSFC/NASA Skip To Content ...
Meta Keywords 1 Detected
insertKeywordsHereAndUncomment
Keywords Cloud Density
webb39 overview13 protostar10 images9 space8 nasa8 material7 science6 mirrors6 features6
Keyword Consistency Keyword density is one of the main terms in SEO
Keyword Freq Title Desc Domain H1 H2
webb 39
overview 13
protostar 10
images 9
space 8
nasa 8
material 7
science 6
mirrors 6
features 6
Google Preview Your look like this in google search result
WEBB SPACE TELESCOPE GSFC/NASA
https://webb.nasa.gov
The Latest NASA Released Webb Image is featured on this page. The James Webb Space Telescope's revolutionary technology will study every phase of cosm
Robots.txt File Detected
http://webb.nasa.gov/robots.txt
Sitemap.xml File No Found
http://webb.nasa.gov/sitemap.xml
Page Size Code & Text Ratio
Document Size: ~65.7 KB
Code Size: ~64.22 KB
Text Size: ~1.48 KB Ratio: 2.25%

Desktop

Desktop Screenshot
Avoid non-composited animations 1 animated element found
Animations which are not composited can be janky and increase CLS
Minimize third-party usage Third-party code blocked the main thread for 0 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading
Avoid large layout shifts 2 elements found
These DOM elements contribute most to the CLS of the page.
Total Blocking Time 0 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds
Cumulative Layout Shift 0.062
Cumulative Layout Shift measures the movement of visible elements within the viewport
Eliminate render-blocking resources Potential savings of 530 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Largest Contentful Paint 1.2 s
Largest Contentful Paint marks the time at which the largest text or image is painted
Reduce unused CSS Potential savings of 41 KiB
Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity
Reduce initial server response time Root document took 960 ms
Keep the server response time for the main document short because all other requests depend on it
Avoids enormous network payloads Total size was 811 KiB
Large network payloads cost users real money and are highly correlated with long load times
Server Backend Latencies 0 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Keep request counts low and transfer sizes small 47 requests • 811 KiB
To set budgets for the quantity and size of page resources, add a budget.json file
Reduce unused JavaScript Potential savings of 66 KiB
Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity
First Meaningful Paint 0.9 s
First Meaningful Paint measures when the primary content of a page is visible
Web app manifest or service worker do not meet the installability requirements 1 reason
Service worker is the technology that enables your app to use many Progressive Web App features, such as offline, add to homescreen, and push notifications. With proper service worker and manifest implementations, browsers can proactively prompt users to add your app to their homescreen, which can lead to higher engagement
Speed Index 3.5 s
Speed Index shows how quickly the contents of a page are visibly populated
Serve static assets with an efficient cache policy 30 resources found
A long cache lifetime can speed up repeat visits to your page
Minimizes main-thread work 0.3 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
Time to Interactive 0.9 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Avoid chaining critical requests 18 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
Enable text compression Potential savings of 95 KiB
Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes
Avoids an excessive DOM size 591 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)
Max Potential First Input Delay 20 ms
The maximum potential First Input Delay that your users could experience is the duration of the longest task
Serve images in next-gen formats Potential savings of 220 KiB
Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption
Network Round Trip Times 0 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
Largest Contentful Paint element 1 element found
This is the largest contentful element painted within the viewport
JavaScript execution time 0.0 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Properly size images Potential savings of 240 KiB
Serve images that are appropriately-sized to save cellular data and improve load time
First Contentful Paint 0.9 s
First Contentful Paint marks the time at which the first text or image is painted

Mobile

Mobile Screenshot
Document uses legible font sizes 99.42% legible text
Font sizes less than 12px are too small to be legible and require mobile visitors to “pinch to zoom” in order to read. Strive to have >60% of page text ≥12px
Network Round Trip Times 0 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
Enable text compression Potential savings of 95 KiB
Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes
Largest Contentful Paint element 1 element found
This is the largest contentful element painted within the viewport
Avoid long main-thread tasks 5 long tasks found
Lists the longest tasks on the main thread, useful for identifying worst contributors to input delay
Eliminate render-blocking resources Potential savings of 1,940 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Avoids an excessive DOM size 590 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)
Time to Interactive 4.1 s
Time to interactive is the amount of time it takes for the page to become fully interactive
JavaScript execution time 0.3 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Reduce unused JavaScript Potential savings of 66 KiB
Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity
Avoid non-composited animations 1 animated element found
Animations which are not composited can be janky and increase CLS
Minimize third-party usage Third-party code blocked the main thread for 30 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading
Server Backend Latencies 0 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Avoid chaining critical requests 18 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
First Contentful Paint 3.1 s
First Contentful Paint marks the time at which the first text or image is painted
Largest Contentful Paint 4.9 s
Largest Contentful Paint marks the time at which the largest text or image is painted
Keep request counts low and transfer sizes small 48 requests • 591 KiB
To set budgets for the quantity and size of page resources, add a budget.json file
Tap targets are not sized appropriately 43% appropriately sized tap targets
Interactive elements like buttons and links should be large enough (48x48px), and have enough space around them, to be easy enough to tap without overlapping onto other elements
First Meaningful Paint 3.4 s
First Meaningful Paint measures when the primary content of a page is visible
Properly size images Potential savings of 39 KiB
Serve images that are appropriately-sized to save cellular data and improve load time
Cumulative Layout Shift 0.047
Cumulative Layout Shift measures the movement of visible elements within the viewport
Serve images in next-gen formats Potential savings of 104 KiB
Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption
Web app manifest or service worker do not meet the installability requirements 1 reason
Service worker is the technology that enables your app to use many Progressive Web App features, such as offline, add to homescreen, and push notifications. With proper service worker and manifest implementations, browsers can proactively prompt users to add your app to their homescreen, which can lead to higher engagement
Minimizes main-thread work 1.7 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
Avoids enormous network payloads Total size was 591 KiB
Large network payloads cost users real money and are highly correlated with long load times
Reduce initial server response time Root document took 980 ms
Keep the server response time for the main document short because all other requests depend on it
First Contentful Paint (3G) 6690 ms
First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network
Speed Index 8.3 s
Speed Index shows how quickly the contents of a page are visibly populated
Total Blocking Time 40 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds
Reduce unused CSS Potential savings of 40 KiB
Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity
Avoid large layout shifts 1 element found
These DOM elements contribute most to the CLS of the page.
Max Potential First Input Delay 140 ms
The maximum potential First Input Delay that your users could experience is the duration of the longest task
Serve static assets with an efficient cache policy 31 resources found
A long cache lifetime can speed up repeat visits to your page

Speed And Optimization Tips

Website speed has a huge impact on performance, affecting user experience, conversion rates and even rankings. ‪‬‬By reducing page load-times, users are less likely to get distracted and the search engines are more likely to reward you by ranking you
Title Website
Congratulations! Your title is optimized
Description Website
Warning! Your description is not optimized
Robots.txt
Congratulations! Your site have a robots.txt file
Sitemap.xml
Warning! Not found a sitemap file for your website
SSL Secure
Congratulations! Your site have Support to HTTPS
Headings
Congratulations! You are using your H1 and H2 tags in your site
Blacklist
Congratulations! Your site is not listed in a blacklist
W3C Validator
Warning! Your site have errors W3C
Accelerated Mobile Pages (AMP)
Warning! Your site not have AMP Version
Domain Authority
Warning! Domain Authority of your website is slow. It is good to have domain authority more than 25.
GZIP Compress
Warning! Your site not is compressed, this can make slower response for the visitors
Favicon
Warning! Your site not have a favicon
Broken Links
Congratulations! You not have broken links View links
First 20 Links Relationship HTTP Status
Webb Home Page Internal Link 301
Our Agency, Industry and Academic Partners Internal Link 301
News Internal Link 301
Events Internal Link 301
Need to Know Internal Link 301
Where Is Webb? Internal Link 301
News All Internal Link 301
About Overview Internal Link 301
Key Facts Internal Link 301
Who Is James Webb? Internal Link 301
FAQ Lite Internal Link 301
FAQ Full Internal Link 301
Launch Internal Link 301
Orbit Internal Link 301
Webb and Hubble Internal Link 301
Innovations Overview Internal Link 301
Microshutters Internal Link 301
Backplane Internal Link 301
Mirrors Internal Link 301
Wavefront Sensing Internal Link 301

Domain Available

Domain (TDL) and Typo Status
webb.nasa.co Available Buy Now!
webb.nasa.us Available Buy Now!
webb.nasa.com Already Registered
webb.nasa.org Already Registered
webb.nasa.net Already Registered
wbb.nasa.gov Available Buy Now!
zebb.nasa.gov Available Buy Now!
sebb.nasa.gov Available Buy Now!

Information Server

Response Header HTTP headers carry information about the client browser, the requested page and the server 
HTTP/1.1 200 OK
Date: Thu, 17 Nov 2022 08:01:40 GMT
Server: WebServer/1.0
X-Frame-Options: sameorigin
Accept-Ranges: bytes
Content-Type: text/html; charset=UTF-8
Strict-Transport-Security: max-age=31536000; includeSubDomains
Content-Security-Policy: upgrade-insecure-requests
DNS Records DNS Resource Records associated with a hostname
View DNS Records
Type Name Value Class TTL
A jwst.gsfc.nasa.gov 129.164.179.27 IN 201
CNAME webb.nasa.gov jwst.gsfc.nasa.gov IN 501
AAAA jwst.gsfc.nasa.gov 2001:4d0:2310:150::27 IN 14301

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