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Report for stackoverflow.com

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Top Priorities

list
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Traffic Rank

visitors
57 most visited website in the World Trend: up (-1)
37 most visited website in US United States
Traffic Rank is provided by Alexa

Visitors Localization

visitors
Low map legend High
CountryPercentDomain (ccTLD)Status
US United States23.7%stackoverflow.usNot available.
IN India12.3%stackoverflow.inNot available.
CN China8.6%stackoverflow.cnNot available.
JP Japan5.3%stackoverflow.jpNot available.
UK United Kingdom3.7%stackoverflow.co.ukNot available.
Registering country code top level domains (ccTLD) can prevent potential competitors from taking advantage of your primary domain reputation. It is also one of the ways to improve country specific SEO and performance. (http://www.searchenginejournal.com/seo-without-boarders-a-guide-to-international-seo-nick-paterman/60092/)

Images

accessibilitySEO-content
We have located images with missing ALT attribute.
Number of images: 15
Missing alt tag: 15

List of images with missing ALT attributes:

  • //i.stack.imgur.com/tKsDb.png (4 locations)
  • //i.stack.imgur.com/sawHl.png
  • //i.stack.imgur.com/eoNf5.png
  • //i.stack.imgur.com/2NOCA.png
  • //i.stack.imgur.com/vobok.png (2 locations)
  • //i.stack.imgur.com/EdUwb.png (2 locations)
  • //i.stack.imgur.com/5d55j.png (2 locations)
  • //i.stack.imgur.com/uE37r.png
  • https://pixel.quantserve.com/pixel/p-c1rF4kxgLUzNc.gif
The "alt" attribute provides a text equivalent for the image. If the browser cannot display an image the alt description will be given in its place. Furthermore, some visitors cannot see images as they might be blind in which the alt tag provides a valuable image description. Finally, search engines utilize the alt attribute for image search indexing. (www.w3.org/QA/Tips/altAttribute)

Title

SEO-content
We have found following title:

"Stack Overflow - Where Developers Learn, Share, & Build Careers"

Length: 63 characters
The <TITLE> element provides a short piece of text describing the document. The title is very important as it shows in the window title bars, bookmarks and search results. Title should be between 60 to 80 characters long. (www.w3.org/QA/Tips/good-titles)

Description Metatag

SEO-content
We have found following description:

"Stack Overflow is the largest, most trusted online community for developers to learn, share​ ​their programming ​knowledge, and build their careers."

Length: 148 characters
The description attribute should provide a concise explanation of a Web page's content. Also, the description is often displayed on search engine results and can indirectly affect page ranking. (en.wikipedia.org/wiki/Meta_element#The_description_attribute)

Keywords Metatag

SEO-content
No Keywords Found.
The keywords attribute was utilized by search engines to provide more accurate search results. Due to the over usage and spamming the keywords attribute has been phased out and is no longer relevant. Google doesn't use the "keywords" meta tag in web search ranking.

Text to HTML Ratio

SEO-content
The Text to HTML ratio is 14.32%
Original content is by far the single most important element to search engines. Low Text to HTML ratio indicates little content for search engines to index. We consider it to be good practice to have a Text to HTML ratio of at least 10% and ideal above 20%

Keyword Density & Consistency

SEO-content
Consistent Keywords % Density # Count T Title D Desc. H <H> A ALT B <b>
ago4.50%96-----
views4.50%96-----
answers4.46%95-----
votes3.85%82-----
mins3.80%81-----
asked3.38%72-----
stack0.94%20114-1
how0.75%16--12--
modified0.75%16-----
overflow0.70%15112-1
mins ago3.80%81-----
stack overflow0.70%15112--
min ago0.66%14-----
stack exchange0.19%4--2--
learn more0.14%3-----
build their careers0.09%2-1---
some random user0.09%2-----
result after freeze0.05%1--1--
rxpy observables always0.05%1--1--
observables always emit0.05%1--1--
Keywords density and consistency are notable factors for optimal page SEO. Preferred keywords should have higher keywords density indicating their importance. Optimally, preferred keywords should also be consistently utilized in multiple essential areas of the page such as title, description meta tag, h1 through h6 headings, alt image attributes, backlinks and internal links anchor text. Keyword density of above 6% can indicate that the word or a phrase appears too many time in the content.

Frames

accessibilitySEO-content
No frames detected.
It is not recommended to use frames or iframes because they can cause problems for search engines. It is best to avoid frames and inline frames whenever possible (searchenginewatch.com/article/2064573/Search-Engines-and-Frames). If frames must be utilized consider <noframes> tag. (www.w3schools.com/tags/tag_noframes.asp).

Flash

accessibilitytechnologySEO-content
No flash detected.
Flash and other reach-media technologies should primarily be utilized for decorative purposes. This makes your site more search engine friendly and improves accessibility (support.google.com/webmasters/bin/answer.py?hl=en&answer=72746#1).

Headings

SEO-content
  • 2 <H1>
    • Learn, Share, Build
    • Top Questions
  • 1 <H2>
    • Looking for more? Browse the complete list of questions, or popular tags. Help us answer unanswered questions.
  • 99 <H3>
    • current community
    • your communities
    • more stack exchange communities
    • Why does this background color not go over my image?
    • BinarySerializer.Serialize Exception: Index was outside the bounds of the array
    • Kendo-UI scrolls to the top of grid after editing and saving a record
    • Sticky overlay with transition
    • Find and Replace works when running with visual studio but when running off of IIS i get null exception error
    • Is there any way to call child component when the child the component is stored within parent component state
    • Angular universal-starter — prerender component multiple times with different data
    • Extracting associated JSON data using the unique key
    • Is Java instance of really so fast?
    • output of GNU gprof in milliseconds or microseconds
    • Jquery, play sound even while in another window
    • Minimum requirements to run an Android app
    • Unable to keep a particular item and ignores the rest
    • Using sweet alert 2 getting this.props is undefined after using Warning alert
    • How to display on one router different components for different users?
    • Event does not belong to eventStore on SECOND Access
    • Glitch when loading ARKit scene second time
    • HTTPS POST request taking
    • Explaination on several iterations of an increment?
    • How to trim all spaces and new lines only of the right side
    • Should System be explicitly imported in a Xamarin.Android class file?
    • PHP Artisan Tinker not working with Laravel 5.5.16
    • How to subscribe to an event on a service in Angular2?
    • VBA- dropdown list influencing shape location
    • Converting a project from C++ to C#
    • Argon.js and tracking custom objects with tracking.js rather than Vuforia?
    • osx - C++14 compiler not detected, multiple versions of gcc
    • how to get application item value in multiple application in a same work-space in Oracle Apex
    • Cancel GitHub invitations to a repository
    • Change the default font size and font name in CKEDITOR
    • Make a B-scan data from A-scan data
    • Update a combobox inside of my datagrid that is bound by a datasource
    • Batch script not working after deploy with SCCM
    • Google BigQuery - python client - creating/managing jobs
    • Can't find the “Override requests with workspace project” in Chrome DevTools Canary
    • Change store name via UpgradeData.php
    • How can I use a patched version of a Maven plugin?
    • Move LOB tablespace on partitioned tables
    • How to switch with another application when redeploying a WAR?
    • LuaJ interrupt script
    • Is it possible to connect zookeeper and kafka via SASL , kafka broker and its clients via SSL?
    • Store fields in the database and read the same in logging
    • Firebase - find out whether child with given name exists
    • Wider and smoother lines in Metal shader
    • Changing the vocabulary by switching de resource file
    • Can I close the client's connection and perform still perform a treatment afterward?
    • AcquireToken async returning same token before expiry time
    • extract year from date and calculate datedifference
    • Multiple layouts for physical keyboard on Android 7
    • Pipeline diagram
    • SpeechRecognizer on Android Wear
    • derby Client/Remote driver and data sources, used to connect to the network server
    • Python - Thread, Sending 20 request - First to arrive, First to serve?
    • How to pass function result to a templage?
    • GAE Stackdriver: SOURCE_LOCATION_ERROR (No code found at…)
    • Ionic / Angluar: Avoiding the ExpressionChangedAfterItHasBeenCheckedError
    • I2C IOCTL Write Failure
    • PostgreSQL pattern match on Umlauts
    • Dealing with python hash() collision
    • Create readable “Message” results from event log
    • .NET Core 1.0 to 2.0 compilation performance problems
    • Dynamic Programming Knapsack select only Unique Items in R
    • Magento 2 custom order grid
    • How to exclude a particular aws AMI from being notified?
    • How to use rtlcss node package with twitter-bootstrap on Laravel?
    • In YamlDotNet: Is there a way to output a null value as an empty string in a sequence?
    • Agent after new email has arrived
    • Select-UI not populating drop down
    • Socket.io client event listeners not listening after server restart and reconnect
    • How to write parametrized tests with groovy-spock using mocks
    • (Matlab) Set and Get functions which work for value classes do not work for handle ones
    • npm doesn't find local binary, but looks in the correct place
    • Enabling CORS in ASP.NET MVC
    • Query my temporary tables outside my java app
    • query Azure Cosmos DB to return no duplicates
    • How to ignore all errors in Acumatica updater
    • multi domain and multi language sitemap.xml subfolder rewrite
    • Get current theme & Section settings via Shopify API or sync to settings_data.json
    • what is the difference between freemarker 2.3.21 and freemarker 2.3.26-incubating
    • Why does this list of different RxPY observables always emit the same thing?
    • ANOVA in R using the function lapply ans terms
    • Tensorflow: Restore model with sparse_placeholder
    • Implementing listener in Robot Framework - data.resource.variables aquired are empty
    • Windows Performance Analyzer - result after freeze in 2 minutes
    • IOS/Objective-C: UIBarButtonItem with Custom Color Image
    • Request header field OriginId is not allowed by Access-Control-Allow-Headers in preflight response
    • Spyder 32 bit xc_Oracle
    • VueJS select a specific element in dom
    • Swift 4: Firebase Timestamp
    • Google Maps - memory leak with dynamic bitmap markers
    • Python 3.6, Wine and asyncio - ImportError: cannot import name '_overlapped'
    • How avoid cache line invalidation from multiple threads writing to a shared array?
    • WebBrowser creates a new audio instance in audio mixer (windows 10)
    • Xamarin Forms : Application.Current.MainPage vs Navigation.PushAsync() vs Navigation.PushModalAsync()
    • Simple way to Dask concatenate (horizontal, axis=1, columns)
    • D3.js v4 horizontal panning only (no zoom)
  • 1 <H4>
    • Hot Network Questions
  • 4 <H5>
    • Stack Overflow
    • Stack Overflow Business
    • Company
    • Stack Exchange Network
  • 0 <H6>
The <h1> to <h6> tags are used to define HTML headings. The <h1> tag should hold the title describing the content of a specific page therefore only one h1 tag is needed per page. There can be any number of h2 - h6 tags but they should be added in order of importance (www.w3schools.com/tags/tag_hn.asp).

Doctype

technologyvalidity
HTML 5
The <!DOCTYPE> declaration tells the web browser about what version of HTML the page is written in. It is good practice to always add the <!DOCTYPE> declaration to the HTML documents, so that the browser knows what type of document to expect. (www.w3schools.com/tags/tag_DOCTYPE.asp)

Character Encoding

technologyvalidity
Not declared.
To display an HTML page correctly, the browser must know what character-set to use (en.wikipedia.org/wiki/Character_encodings_in_HTML).

Language

usability
Declared Language: None
Language Attribute: None
The HTML "lang" attributes and language metatag define the base language to be used for displaying text and characters on a Website.

W3C Markup Validation

validity
Status: FAILED [6 errors, 5 warning(s)]
It is good practice to use valid HTML/XHTML markup as it ensures that the search engines can read the website correctly as well as it improves cross browser compatibility (W3C Markup Validation Service).

Deprecated HTML elements

technologyvalidity
Good, no deprecated elements found.
A deprecated element is one that has been outdated by newer constructs. Deprecated elements may become obsolete in future versions of HTML so it is recommended not to use them. (webdesign.about.com/od/htmltags/a/bltags_deprctag.htm)

Nested HTML Tables

accessibilitytechnology
Great, no nested tables detected.
In general it is not recommended to use nested tables or to utilize tables for page layout. Nested tables are known to cause performance issues due to increased HTML size and rendering time. It is better to use CSS layout instead.

Web Analytics

technology
Yes, we have detected following web analytics tools:
  • Google analytics icon Google™ Analytics
  • Quantcast analytics icon Quantcast™ Measure
Web Analytics Tools collect and measure information about visitor activity on a website. Well interpreted web traffic data is invaluable in determining a successfully web strategy and assessing the effectiveness of a website. At a minimum, we recommend to utilize at least one web analytics tool.

robots.txt

SEO
Yes, https://stackoverflow.com/robots.txt

Your robots.txt file is blocking search engines access to parts of the website.

User-Agent: *
  • Disallow: /posts/
  • Disallow: /posts?
  • Disallow: /amzn/click/?
See all 87 disallow directives
A robots.txt file restricts access to search engine robots that crawl the web. (www.robotstxt.org/robotstxt.html)

XML Sitemap

SEO
Not found
Sitemaps inform search engines about pages available for crawling. In its simplest form, a Sitemap is an XML file that lists URLs for a site along with additional metadata about each URL. XML sitemap should help search engines to crawl the site more intelligently. (http://www.sitemaps.org/protocol.html)

Accessibility Check

accessibility
WCAG 2.0 (AA) Conformance Test: FAILED [26 error(s)]
  1. Document language not identified.
    [Line 2, Col 1] <html> <head> <title>Stack Overflow - Where Developers Learn, Share, &amp; Build Careers</titl ...
    For HTML documents add the lang attribute and a valid ISO-639-1 two letter language code to the opening HTML element. For XHTML documents add both the lang and xmllang attributes with a valid ISO-639-1 two letter language code to the opening HTML element.
  2. Document has invalid language code.
    [Line 2, Col 1] <html> <head> <title>Stack Overflow - Where Developers Learn, Share, &amp; Build Careers</titl ...
    Add a valid 2 letter or 3 letter language code as defined in the ISO 639 specification to the HTML 'lang' attribute. For XHTML, both 'lang' and 'xml:lang' must be set.
Subscribe to review all 26 errors
Following Web accessibility standards while developing a website can help users with specific needs, such as visually impaired, motor/mobility, auditory, seizures, as well as cognitively and intellectually impaired disabilities. Some of these fixes include general seo applications like Alt tags, Form labels, fixing empty links and adding alternative text. To read more about accessibility guidelines follow this link Web Content Accessibility Guidelines (WCAG) Overview.

Mobile Rendering

mobile
Mobile internet usage has been exceeding PC's since 2014 and growing so it is critical for pages to render correctly on mobile devices.

Mobile Optimization

mobileperformanceSEO
Mobile PageSpeed analyzes webpages and evaluates its performance while providing suggestions on reducing page load times. Google is incorporating website speed in search ranking (http://www.mattcutts.com/blog/site-speed)

Mobile Experience

mobileusability
Mobile users have now become a critical part of online visits. Making the website mobile friendly is no longer an option but rather necessity. (https://developers.google.com/webmasters/smartphone-sites/)

Favicon

usability
The Favicon is a small icon associated with a website. The Favicon is important because it is displayed next to the website's URL in the address bar of the browser as well as in bookmarks and shortcuts. (en.wikipedia.org/wiki/Favicon)

Custom 404 Error Page

usability
Yes, custom 404 error page detected.
A 404 is a standard http response code for a resource that cannot be located on the server. Web servers usually return a "404 Not Found" error page for non-existing pages. Unfortunately, these default error pages are very generic and a not very user friendly, therefore, using a custom 404 error page is highly recommended.

Process of returning http status code "200 OK" for a non-existent page or redirecting users to another url is called soft 404. Soft 404 errors are problematic for search engines and are not advisable. (https://support.google.com/webmasters/answer/181708)

Printability

usability
Print-friendly pages are designed to fit on an 8.5"x11" or A4 sheet and usually include only the content of the page, along with source information. (webdesign.about.com/od/printerfriendly/a/aa041403a.htm)

W3C CSS Validation

validity
Status: FAILED [105 error(s)]
It is recommended to use valid CSS to ensure that the website displays correctly. (W3C CSS Validation Service).

Domain Age

SEO-Authority
Your domain was registerd for the first time: 13 years, 9 months, 28 days ago.
Age of the domain is one of the many signals that search engines utilize for ranking. Brand new domains generally have more difficult time to rank high for the first few months. (http://www.coconutheadphones.com/does-domain-agematter)

Domain Expiration

SEO-Authority
Your domain expires in: 3 months, 8 days, 9 hours.
Domain expiration far in to the future is considered a good practice as it promotes confidence in your website, decreases chances of losing domain and in certain cases might help with search engine ranking. (https://www.hover.com/blog/three-reasons-to-renew-your-domain-names-for-five-years/)

IP Canonicalization

SEO
No, your site's IP 151.101.129.69 does not redirect to stackoverflow.com.
Some web spiders index websites using IP as well as domain name which can cause duplicate content if there is no IP Canonicalization. (www.mattcutts.com/blog/seo-advice-url-canonicalization)

URL Canonicalization

SEO
Yes, both the www.stackoverflow.com and stackoverflow.com resolve to the same URL.
Domain name with WWW and without can be considered as different pages causing duplicate content for search engines. (www.mattcutts.com/blog/seo-advice-url-canonicalization)

Page Speed

performanceSEO
Google Page Speed score: 83% (High)
Rq. Requests Hst. Hosts LT Load time Html Img Images JS JavaScript CSS F Flash O Other PS Page Size
49191.88s252.59 KB169.9 KB752.55 KB589.42 KB0 B4.11 KB1.73 MB

RecommendationImpact
Avoid landing page redirects
None
Enable compression
None
Leverage browser caching
Low
Reduce server response time
None
Minify CSS
None
Minify HTML
None
Minify JavaScript
None
Eliminate render-blocking JavaScript and CSS in above-the-fold content
High
Optimize images
Medium
Prioritize visible content
None

Subscribe for more details
PageSpeed analyzes webpages and evaluates its performance while providing suggestions on reducing page load times. Google is now incorporating website speed in search ranking (http://www.mattcutts.com/blog/site-speed)

Server Information

security

ISP:
Fastly
Server IP:
151.101.1.69
Server Location:
US CALIFORNIA, San Francisco

Name Server 1:
ns-1033.awsdns-01.org (205.251.196.9)
Name Server 2:
ns-358.awsdns-44.com (205.251.193.102)
Name Server 3:
ns-cloud-e1.googledomains.com (216.239.32.110)
Name Server 4:
ns-cloud-e2.googledomains.com (216.239.34.110)
Your server's IP address and location have minor impact on the country specific SEO. It is recommend to host the website in the country where the number of vistors is desired to be the highest. Search engines take the geolocation of a server into account. (http://www.youtube.com/watch?v=hXt23AXlJJU)

HTTPS (SSL)

security
Issued To:
Common Name (CN):
*.stackexchange.com
Issuer:
Common Name (CN):
DigiCert SHA2 High Assurance Server CA
Oranization (O):
DigiCert Inc
Oranizational Unit (OU):
www.digicert.com
Period of Validity
Begins On:
05/21/2016
Expires On:
08/14/2019
Google™ is now treating HTTPS as a ranking signal. HTTPS is a secure web protocol that allows for encrypted communication between website and the client. HTTPS protocol requires your website to have an SSL certificate, which can be purchased from a Certificate Authority (CA) or SSL vendor. (http://googleonlinesecurity.blogspot.in/2014/08/https-as-ranking-signal_6.html).

Safe Browsing

security
Yes
Safe Browsing is a service provided by Google that enables applications to check URLs against Google's constantly updated lists of suspected phishing and malware pages. If your site is marked as unsafe see our guide on how to fix websites blocked by google safe browsing

Spam Blacklist

security
Good, your IP 151.101.129.69 is not blacklisted.
Spammer directories provide lists of IPs from which spam distribution is reported. Emails sent from the blocked IPs are subject to closer scrutiny and are much less likely to be delivered. For email campaigns it is recommended to utilize professional email services to ensure that your website IP is not blocked. (www.stopforumspam.com)

Email Address Obfuscation

security
There is 1 email in plain text on the webpage:
It is recommended to obfuscate email addresses posted in public. This prevents email addresses from being automatically harvested by spam bots which helps to decrease number of unsolicited emails. See our email obfuscation techniques guide for more details.

Directory Browsing

security
Great, your server has directory browsing disabled.
Protect Webserver directories from unwanted browsing. To enhance security, directory browsing should be disabled unless you have a specific reason to enable it. If you enable directory browsing, make sure that you only enable it on the particular directory or directories that you want to share. (http://technet.microsoft.com/en-us/library/cc731109)

Whois Privacy

security
No contact information available.
Whois Privacy is a service that prevents domain owner contact information from being displayed in the publicly available Whois records. This can help to cut down on unwanted spam but utilizing Whois privacy should be evaluated against business model and branding strategy.

Server Signature

security
Good, your server does not provide version information.
Attackers can utilize server signature versioning information to their advantage therefore it is recommended to disable it when possible. (Disable server signature for Apache or IIS).