Skip to content
    Moz logo Menu open Menu close
    • Products
      • Moz Pro
      • Moz Pro Home
      • Moz Local
      • Moz Local Home
      • STAT
      • Moz API
      • Moz API Home
      • Compare SEO Products
      • Moz Data
    • Free SEO Tools
      • Domain Analysis
      • Keyword Explorer
      • Link Explorer
      • Competitive Research
      • MozBar
      • More Free SEO Tools
    • Learn SEO
      • Beginner's Guide to SEO
      • SEO Learning Center
      • Moz Academy
      • MozCon
      • Webinars, Whitepapers, & Guides
    • Blog
    • Why Moz
      • Digital Marketers
      • Agency Solutions
      • Enterprise Solutions
      • Small Business Solutions
      • The Moz Story
      • New Releases
    • Log in
    • Log out
    • Products
      • Moz Pro

        Your all-in-one suite of SEO essentials.

      • Moz Local

        Raise your local SEO visibility with complete local SEO management.

      • STAT

        SERP tracking and analytics for enterprise SEO experts.

      • Moz API

        Power your SEO with our index of over 44 trillion links.

      • Compare SEO Products

        See which Moz SEO solution best meets your business needs.

      • Moz Data

        Power your SEO strategy & AI models with custom data solutions.

      Turn SEO data into actionable content briefs

      Turn SEO data into actionable content briefs

      Learn more
    • Free SEO Tools
      • Domain Analysis

        Get top competitive SEO metrics like DA, top pages and more.

      • Keyword Explorer

        Find traffic-driving keywords with our 1.25 billion+ keyword index.

      • Link Explorer

        Explore over 40 trillion links for powerful backlink data.

      • Competitive Research

        Uncover valuable insights on your organic search competitors.

      • MozBar

        See top SEO metrics for free as you browse the web.

      • More Free SEO Tools

        Explore all the free SEO tools Moz has to offer.

      Let your business shine with Listings AI

      Let your business shine with Listings AI

      Get found
    • Learn SEO
      • Beginner's Guide to SEO

        The #1 most popular introduction to SEO, trusted by millions.

      • SEO Learning Center

        Broaden your knowledge with SEO resources for all skill levels.

      • On-Demand Webinars

        Learn modern SEO best practices from industry experts.

      • How-To Guides

        Step-by-step guides to search success from the authority on SEO.

      • Moz Academy

        Upskill and get certified with on-demand courses & certifications.

      • MozCon

        Save on Early Bird tickets and join us in London or New York City

      Access 20 years of data with flexible pricing
      Moz API

      Access 20 years of data with flexible pricing

      Find your plan
    • Blog
    • Why Moz
      • Digital Marketers

        Simplify SEO tasks to save time and grow your traffic.

      • Small Business Solutions

        Uncover insights to make smarter marketing decisions in less time.

      • Agency Solutions

        Earn & keep valuable clients with unparalleled data & insights.

      • Enterprise Solutions

        Gain a competitive edge in the ever-changing world of search.

      • The Moz Story

        Moz was the first & remains the most trusted SEO company.

      • New Releases

        Get the scoop on the latest and greatest from Moz.

      Surface actionable competitive intel
      New Feature

      Surface actionable competitive intel

      Learn More
    • Log in
      • Moz Pro
      • Moz Local
      • Moz Local Dashboard
      • Moz API
      • Moz API Dashboard
      • Moz Academy
    • Avatar
      • Moz Home
      • Notifications
      • Account & Billing
      • Manage Users
      • Community Profile
      • My Q&A
      • My Videos
      • Log Out

    The Moz Q&A Forum

    • Forum
    • Questions
    • Users
    • Ask the Community

    Welcome to the Q&A Forum

    Browse the forum for helpful insights and fresh discussions about all things SEO.

    1. Home
    2. SEO Tactics
    3. Technical SEO
    4. The W3C Markup Validation Service - Good, Bad or Impartial?

    Moz Q&A is closed.

    After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.

    The W3C Markup Validation Service - Good, Bad or Impartial?

    Technical SEO
    4
    4
    1477
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as question
    Log in to reply
    This topic has been deleted. Only users with question management privileges can see it.
    • artdivision
      artdivision last edited by

      Hi guys,

      it seems that now days it is almost impossible to achieve 0 (Zero) Errors when testing a site via (The W3C Markup Validation Service - https://validator.w3.org). With analytic codes, pixels and all kind of tracking and social media scripts gunning it seems to be an unachievable task.

      My questions to you fellow SEO'rs out there are 2:

      1. How important and to what degree of effort do you go when you technically review a site and make the decision as to what needs to be fixed and what you shouldn't bother with.

      2. How do you argue your corner when explaining to your clients that its impossible to active 100% validation.

      *As a note i will say that i mostly refer to Wordpress driven sites.

      would love ot hear your take.

      Daniel.

      1 Reply Last reply Reply Quote 0
      • EGOL
        EGOL last edited by

        I am my own client, so I can be as picky as a want, and I take care of the details that I feel are important.

        I pay close attention to how the site is responding and rendering when I pretend that I am a visitor.  I pay even more attention when a customer or visitor writes to me with a complaint.   In my opinion, if the site is working great then all is good.     🙂

        W3C validation seems to be of jugular importance to W3C evangelists.  They will tell you that you will burn in Hell if you don't achieve it with flying colors.  People who want to sell you their services will point at any fault that can be detected.

        Practical people have a different opinion.  I try to be as practical as possible.

        1 Reply Last reply Reply Quote 1
        • ATP
          ATP last edited by

          I agree with Andy,

          I use it as a guidance tool on any website i build. It serves a purpose, to check things are understood how they should be by a predetermined standard. But like any other automated tool it compares to set requirements that cannot always be met and cannot identify and ok these exceptions.

          As long as you understand the error its pointing out and why its pointing it out, and know that despite this the code is rendering correctly and all outcomes are working as expected then there is no problem.

          From an SEO stand point, aslong as google see's your site how you want it too i think it is a very very minor factor. Hell all of google returns errors of some variety.

          1 Reply Last reply Reply Quote 1
          • Andy.Drinkwater
            Andy.Drinkwater last edited by

            Hi Yiannis,

            I tend to add these in as an advisory to my clients because for the most part, and unless I see something specific, the results have absolutely no effect on SEO. If they wish to act on them, it is for their developers to handle.

            I don't argue my corner really - never had to. I just tell them like it is - the site is rendering fine in everything and with no issues, so fix errors if you have the time and resources.

            As I said, unless I spot something that is an actual problem, then it tends to just get bypassed.

            -Andy

            1 Reply Last reply Reply Quote 1
            • 1 / 1
            • First post
              Last post

            Got a burning SEO question?

            Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.


            Start my free trial


            Browse Questions

            Explore more categories

            • Moz Tools

              Chat with the community about the Moz tools.

            • SEO Tactics

              Discuss the SEO process with fellow marketers

            • Community

              Discuss industry events, jobs, and news!

            • Digital Marketing

              Chat about tactics outside of SEO

            • Research & Trends

              Dive into research and trends in the search industry.

            • Support

              Connect on product support and feature requests.

            • See all categories

            Related Questions

            • williamhuynh

              Good to use disallow or noindex for these?

              technical seo noindex disallow

              Hello everyone, I am reaching out to seek your expert advice on a few technical SEO aspects related to my website. I highly value your expertise in this field and would greatly appreciate your insights.
              Below are the specific areas I would like to discuss: a. Double and Triple filter pages: I have identified certain URLs on my website that have a canonical tag pointing to the main /quick-ship page. These URLs are as follows: https://www.interiorsecrets.com.au/collections/lounge-chairs/quick-ship+black
              https://www.interiorsecrets.com.au/collections/lounge-chairs/quick-ship+black+fabric Considering the need to optimize my crawl budget, I would like to seek your advice on whether it would be advisable to disallow or noindex these pages. My understanding is that by disallowing or noindexing these URLs, search engines can avoid wasting resources on crawling and indexing duplicate or filtered content. I would greatly appreciate your guidance on this matter. b. Page URLs with parameters: I have noticed that some of my page URLs include parameters such as ?variant and ?limit. Although these URLs already have canonical tags in place, I would like to understand whether it is still recommended to disallow or noindex them to further conserve crawl budget. My understanding is that by doing so, search engines can prevent the unnecessary expenditure of resources on indexing redundant variations of the same content. I would be grateful for your expert opinion on this matter. Additionally, I would be delighted if you could provide any suggestions regarding internal linking strategies tailored to my website's structure and content. Any insights or recommendations you can offer would be highly valuable to me. Thank you in advance for your time and expertise in addressing these concerns. I genuinely appreciate your assistance. If you require any further information or clarification, please let me know. I look forward to hearing from you. Cheers!

              Technical SEO | | williamhuynh
              0
            • JoeySolicitor

              Schema Markup Warning "Missing field "url" (optional)"

              schema schema markup serp features

              Hello Moz Team, I hope everyone is doing well & good, I need bit help regarding Schema Markup, I am facing issue in my schema markup specifically with my blog posts, In my majority of the posts I find error "Missing field "url" (optional)"
              As this schema is generated by Yoast plugin, I haven't applied any custom steps. Recently I published a post https://dailycontributors.com/kisscartoon-alternatives-and-complete-review/ and I tested it at two platforms of schema test 1, Validator.Schema.org
              2. Search.google.com/test/rich-results So the validator generate results as follows and shows no error
              Schema without error.PNG It shows no error But where as Schema with error.PNG in search central results it gives me a warning "Missing field "url" (optional)". So is this really be going to issue for my ranking ? Please help thanks!

              Technical SEO | | JoeySolicitor
              6
            • nazfazy

              Using 2 cache plugin good or not?

              Hi, Can anyone tell me - whether using  2 cache plugin helps or it cause any issue? Besides, when i used w3 cache plugin in WordPress its found like inline CSS issue to get cleared. So, i tried auto optimized but my website Soc prollect gone crashed in between while using the some.  Is there any solution and can anyone tell me which plugin advantages to speed the site by removing java script and inline css at a time.

              Technical SEO | | nazfazy
              0
            • usDragons

              Spammers created bad links to old hacked domain, now redirected to our new domain. Advice?

              My client had an old site hacked (let's call it "myolddomain.com") and the hackers created many links in other hacked sites with links such as http://myolddomain.com/styless.asp?jordan-12-taxi-kids-cheap-T8927.html The old myolddomain.com site was redirected to a different new site since then, but we still see over a thousand spam links showing up in the new site's Search Console 404 crawl errors report. Also, using the links: operator in google search, we see many results of spam links. Should we be worried about these bad links pointing to our old site and redirecting to 404s on the new site? What is the best recommendation to clean them up? Ignore? 410s? Other? I'm seeing conflicting advice out there. The old site is hosted by the client's previous web developer who doesn't want to clean anything up on their end without an ongoing hosting contract. So beyond turning redirects on or off, the client doesn't want to pay for any additional hosting. So we don't have much control over anything related to "myolddomain.com". 😞 Thanks in advance for any assistance!

              Technical SEO | | usDragons
              0
            • tbinga

              Schema markup for products is missing "price": Is this bad?

              Hey guys, So a current client of mine has an e-commerce shop with a few hundred products. They purposely choose to keep the prices off of their website, which is causing errors in Google Webmaster Tools. Basically the error shows: Error: Structured Data > Product (markup: schema.org) Error type: missing price 208 items with error Is this a huge deal? Or are we allowed to have non-numerical prices for schema ie. "call for quote"

              Technical SEO | | tbinga
              1
            • Cocoonfxmedia

              Website credits for designers - good or bad

              Hi My core service is web design and development. I often place a credit on my clients websites pointing them back to my web design or web development pages. Is this a wise practice with penguin and panda updates? Would this also pull my ranking down?

              Technical SEO | | Cocoonfxmedia
              0
            • Zilla

              Move established site from .co.uk to .org - good or bad idea?

              I am currently considering moving our site from the current .co.uk domain to the .org version which we also own. The site is established and indexed for 7 years, ranks well and has circa 10k traffic per month which is mainly UK & US traffic. The reason for the change to the .org domain is to make the site more global facing and give us the opportunity to develop the site into multi language within directories (.org/es/ etc.) and then target those to the local search engines. For the kind of site it is (community based) it wouldn’t really work to split this into lots of separate country targeted domains. So the choice is to either stick with the .co.uk and add the other foreign language specific content in directories within the .co.uk or move to the .org and do the same (there is also a potential third option of purchasing the .com which is currently unused but that could be pricey!) We are also planning a big overhaul of the site with redesign, lots of added content and reorganisation of the site – but are thinking that it would be better to move the domain on a 1:1 basis first with the current design, content and URL structure in place and then do the other changes 2 or 3 months down the line. I have read up on SEOmoz, google guidelines etc on moving a site to a new domain and understand the theoretical approach of moving the site and the steps to take (1to1 301 redirects, sitemaps on old and new etc) and I will retain ownership of the .co.uk so the redirects can remain in place indefinitely. However having worked so hard to get the site to where it is in the search engines and traffic levels I am very worried about whether the domain change is a good move. I am more than happy to accept a temporary fluctuation in rankings & traffic for 1 – 4 weeks as reported may happen as long as I can be sure it will return after a temporary period and be as strong (or almost as strong) as the previous rankings / traffic. Looking for peoples experiences to give me the confidence / reassurance to go ahead with this or any info on why I shouldn’t Thanks in advance for your advice. Adrian.

              Technical SEO | | Zilla
              0
            • Chammy

              How much impact does bad html coding really have on SEO?

              My client has a site that we are trying to optimise. However the code is really pretty bad. There are 205 errors showing when W3C validating. The >title>, , <keywords> tags are appearing twice. There is truly excessive javascript. And everything has been put in tables.</keywords> How much do you think this is really impacting the opportunity to rank? There has been quite a bit of discussion recently along the lines of is on-page SEO impacting anymore. I just want to be sure before I recommend a whole heap of code changes that could cost her a lot - especially if the impact/return could be miniscule. Should it all be cleaned up? Many thanks

              Technical SEO | | Chammy
              0

            Get started with Moz Pro!

            Unlock the power of advanced SEO tools and data-driven insights.

            Start my free trial
            Products
            • Moz Pro
            • Moz Local
            • Moz API
            • Moz Data
            • STAT
            • Product Updates
            Moz Solutions
            • SMB Solutions
            • Agency Solutions
            • Enterprise Solutions
            • Digital Marketers
            Free SEO Tools
            • Domain Authority Checker
            • Link Explorer
            • Keyword Explorer
            • Competitive Research
            • Brand Authority Checker
            • Local Citation Checker
            • MozBar Extension
            • MozCast
            Resources
            • Blog
            • SEO Learning Center
            • Help Hub
            • Beginner's Guide to SEO
            • How-to Guides
            • Moz Academy
            • API Docs
            About Moz
            • About
            • Team
            • Careers
            • Contact
            Why Moz
            • Case Studies
            • Testimonials
            Get Involved
            • Become an Affiliate
            • MozCon
            • Webinars
            • Practical Marketer Series
            • MozPod
            Connect with us

            Contact the Help team

            Join our newsletter
            Moz logo
            © 2021 - 2025 SEOMoz, Inc., a Ziff Davis company. All rights reserved. Moz is a registered trademark of SEOMoz, Inc.
            • Accessibility
            • Terms of Use
            • Privacy

            Looks like your connection to Moz was lost, please wait while we try to reconnect.