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Operating Systems

14 webb.nasa.gov Last Updated: 2 months

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

Desktop

Mobile

Performance Desktop Score 91%
Best Practices Desktop Score 100%
SEO Desktop Score 100%
PWA Desktop Score 22%
Performance Mobile Score 64%
Best Practices Mobile Score 92%
SEO Mobile Score 95%
PWA Mobile Score 20%
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 30 Characters
WEBB SPACE TELESCOPE GSFC/NASA
Meta Description 350 Characters
NASA's Webb Space Telescope: From arrival at the ESA launch Facility in Kourou French Guiana, through launch, deployment, commissioning and the first science images, the pages linked here are your starting point for exploring everything Webb. The James Webb Space Telescope's revolutionary technology will study every phase of cosmic history—from wit
Effective URL 21 Characters
https://webb.nasa.gov
Excerpt Page content
Webb Space Telescope GSFC/NASA Skip To Content JAMES WE...
Meta Keywords 1 Detected
Keywords Cloud Density
webb28 overview13 images8 news7 mirrors6 space6 launch6 media5 jwst5 nasa5
Keyword Consistency Keyword density is one of the main terms in SEO
Keyword Freq Title Desc Domain H1 H2
webb 28
overview 13
images 8
news 7
mirrors 6
space 6
launch 6
media 5
jwst 5
nasa 5
Google Preview Your look like this in google search result
WEBB SPACE TELESCOPE GSFC/NASA
https://webb.nasa.gov
NASA's Webb Space Telescope: From arrival at the ESA launch Facility in Kourou French Guiana, through launch, deployment, commissioning and the first
Robots.txt File Detected
Sitemap.xml File No Found
Page Size Code & Text Ratio
Document Size: ~55.78 KB
Code Size: ~53.02 KB
Text Size: ~2.76 KB Ratio: 4.95%

Desktop

Desktop Screenshot
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
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
Largest Contentful Paint 1.2 s
Largest Contentful Paint marks the time at which the largest text or image is painted
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
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
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
Serve images in next-gen formats Potential savings of 1,605 KiB
Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption
Enable text compression Potential savings of 99 KiB
Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes
Eliminate render-blocking resources Potential savings of 560 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Time to Interactive 0.9 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Keep request counts low and transfer sizes small 54 requests • 3,004 KiB
To set budgets for the quantity and size of page resources, add a budget.json file
Properly size images Potential savings of 40 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
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 Meaningful Paint 0.9 s
First Meaningful Paint measures when the primary content of a page is visible
Largest Contentful Paint element 1 element found
This is the largest contentful element painted within the viewport
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 chaining critical requests 16 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
Avoid large layout shifts 1 element found
These DOM elements contribute most to the CLS of the page.
Speed Index 2.2 s
Speed Index shows how quickly the contents of a page are visibly populated
Avoids an excessive DOM size 554 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)
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
Avoid enormous network payloads Total size was 3,004 KiB
Large network payloads cost users real money and are highly correlated with long load times
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
Serve static assets with an efficient cache policy 40 resources found
A long cache lifetime can speed up repeat visits to your page
Reduce unused JavaScript Potential savings of 64 KiB
Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity
Total Blocking Time 0 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds

Mobile

Mobile Screenshot
Max Potential First Input Delay 70 ms
The maximum potential First Input Delay that your users could experience is the duration of the longest task
Avoid large layout shifts 4 elements found
These DOM elements contribute most to the CLS of the page.
Document uses legible font sizes 98.96% 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
Eliminate render-blocking resources Potential savings of 2,200 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
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
Keep request counts low and transfer sizes small 54 requests • 2,997 KiB
To set budgets for the quantity and size of page resources, add a budget.json file
Serve images in next-gen formats Potential savings of 1,605 KiB
Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption
Enable text compression Potential savings of 99 KiB
Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes
Avoid enormous network payloads Total size was 2,997 KiB
Large network payloads cost users real money and are highly correlated with long load times
Total Blocking Time 10 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds
Defer offscreen images Potential savings of 4 KiB
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive
Tap targets are not sized appropriately 45% 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
Cumulative Layout Shift 0.054
Cumulative Layout Shift measures the movement of visible elements within the viewport
Reduce initial server response time Root document took 940 ms
Keep the server response time for the main document short because all other requests depend on it
Avoids an excessive DOM size 554 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)
Minimize third-party usage Third-party code blocked the main thread for 20 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
First Meaningful Paint 3.4 s
First Meaningful Paint measures when the primary content of a page is visible
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
Minimizes main-thread work 1.3 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
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
First Contentful Paint (3G) 6816 ms
First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network
Avoid chaining critical requests 16 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
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
Serve static assets with an efficient cache policy 40 resources found
A long cache lifetime can speed up repeat visits to your page
Avoid long main-thread tasks 8 long tasks found
Lists the longest tasks on the main thread, useful for identifying worst contributors to input delay
Largest Contentful Paint 5.1 s
Largest Contentful Paint marks the time at which the largest text or image is painted
Speed Index 5.8 s
Speed Index shows how quickly the contents of a page are visibly populated
First Contentful Paint 3.4 s
First Contentful Paint marks the time at which the first text or image is painted
Properly size images Potential savings of 39 KiB
Serve images that are appropriately-sized to save cellular data and improve load time
Reduce unused JavaScript Potential savings of 64 KiB
Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity
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
Time to Interactive 8.1 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Largest Contentful Paint element 1 element found
This is the largest contentful element painted within the viewport

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

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: Sun, 17 Jul 2022 10:58:26 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