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.

      Let your reputation grow with Reviews AI
      Moz Local

      Let your reputation grow with Reviews AI

      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.

      NEW Keyword Suggestions by Topic
      Moz Pro

      NEW Keyword Suggestions by Topic

      Learn more
    • 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

      Unlock flexible pricing & new endpoints
      Moz API

      Unlock flexible pricing & new endpoints

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

    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.

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

    Technical SEO
    5
    7
    5407
    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.
    • Chammy
      Chammy last edited by

      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

      1 Reply Last reply Reply Quote 0
      • Nobody1596916721222
        Nobody1596916721222 @Chammy last edited by

        Hi Chammy,

        I inherited a site that reported 3,184 crawl errors in MOZ and a significant number of them (nearly 600) were duplicate titles and content. I have that down to under 1,000 total errors and only 86 critical errors. I have seen my ranking grow pretty substantially and in one week had 6 pages increase over 20 positions in rank. I can share the MOZ Rank Report if you would like to see it.

        So yes, it does have an impact.

        1 Reply Last reply Reply Quote 0
        • DougRoberts
          DougRoberts @Chammy last edited by

          I'm sorry, I don't have any evidence from the user experience point of view,. although I would also be interested to see the results of any studies.

          I will say that from a site management/maintenance point of view it makes sense to try and keep the code as clean as possible. I've been involved in project were a considerable chunk of the cost was incurred due to the amount of time and effort that was required to unravel the mess even before any new changes were made!

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

            Thanks very much everyone - very helpful.

            Good point re page speed - the pages are certainly slow to load so this could well be due to the huge amount of js and bad code.

            And yes, think the duplicate tags should be sorted - this shouldn't be difficult.

            Has anyone got any tangible results that they've seen as a result of cleaning up js and code?

            DougRoberts Nobody1596916721222 2 Replies Last reply Reply Quote 0
            • DougRoberts
              DougRoberts last edited by

              If you've got things like duplicate title and meta-description's going on then I'd certainly take a look at fixing those. Being able to manage these two tags is vital to managing the way your pages will appear in the search results. (And your title tag is an important ranking factor).

              Normally, if your page doesn't validate then it's not a major problem and search engines won't penalise you for it. If however, your page is so badly crafted that the html errors, and general page structure makes it difficult for the search engines (and humans) to read your page then you're going to suffer.

              The key is to make sure that your site/page content is accessible. How accessible is your page to someone with disabilities, using a screen reader etc.

              You've got to make sure that the search engines can understand what your page is about or your page won't be seen as a relevant page for any search terms...

              How bad is it? How does google render the page in it's instant previews (you can check this is Google Webmaster tools)

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

                I personally don't worry about bad code unless it slows down my page or can possibly make things confusing for search engines or readers.

                If the title and meta are appearing twice this could be confusing for search engines, so I would change this.  But, if you've got things like an unclosed

                here and there I personally don't think that's going to be much of a factor.

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

                  Invalid code has a small effect on ranking. However, if the invalid code causes usability issues such as load time and or causes a high bounce rate then it can lower your rankings and of course cut back on conversions.

                  Some of it is a higher priority than others. I would say defo remove the meta keywords.

                  Combine JS pages. The tables while out of date is not a big issue.

                  If you have the time and resources then yes it should be cleaned up. If not then clean up major problems

                  1 Reply Last reply Reply Quote 0
                  • 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

                  • m1700

                    does <base> in html affect seo?

                    hey, just wanna know  does <base> in head of website affect SEO? and if it's a yes, how?

                    Technical SEO | | m1700
                    1
                  • AliMac26

                    Is Removing Breadcrumbs Detrimental for SEO?

                    We have full navigational breadcrumbs on our site for the menu and the brand menu. i.e. Home > Clothing > Jackets Brand > Brand Name > Brand Jackets There's been talk of removing this and having it like Chico's does, where on item pages they just have a link at the top to previous category (i.e. you're on a shirt product page and at the top it says "Back to Tops" instead of listing Home > Clothing > Tops) Is doing something like this detrimental to SEO? From what I've read Breadcrumbs are for user experience but I just want to be sure.

                    Technical SEO | | AliMac26
                    0
                  • JimLynch

                    CSS background image links bad for seo?

                    On one of the websites I manage SEO for, the developers are changing how our graphical links are coded. They're basically coding in such away where there is no anchor text and no alt tag, so for example: So there's no anchor nor alt context for Google's crawler. How badly will this affect SEO, or is it extremely minimal and I shouldn't worry about? Thanks in advance.

                    Technical SEO | | JimLynch
                    0
                  • Jseddon92

                    Domain prefix changed, will this impact SEO?

                    Our web development team have changed our domain prefix from www to non www due to a server change. Our SSL certificate would not be recognised under www and would produce a substantial error message when visiting the secure parts of our website. To prevent issues with old links they have added a permanent 301 redirect from www. to non www. urls until our sitemap catches up. Would this impact our SEO efforts or would it have no impact as a redirect has been placed? Thanks

                    Technical SEO | | Jseddon92
                    0
                  • TeamacPaints

                    Can a CMS affect SEO?

                    As the title really, I run www.specialistpaintsonline.co.uk and 6 months ago when I first got it it had bad links which google had put a penalty against it so losts it value. However the penalty was lift in Sept, the site corresponds to all guidelines and seo work has been done and constantly monitored. the issue I have is sales and visits have not gone up, we are failing fast and running on 2 or 3 sales a month isn't enough to cover any sort of cost let alone wages. hence my question can the cms have anything to do with it? Im at a loss and go grey any help or advice would be great. thanks in advance.

                    Technical SEO | | TeamacPaints
                    0
                  • ckroaster

                    Do Abbreviations Hurt SEO Results?

                    We have certain products that we've abbreviated since it's a bit too long.  For example, the word Fair Trade Organic is one of our categories and we abbreviate it to FTO. If I put FTO  on our meta tag titles and links instead of the actual word, would that provide a weaker result?

                    Technical SEO | | ckroaster
                    0
                  • Prime85

                    Are 404 Errors a bad thing?

                    Good Morning... I am trying to clean up my e-commerce site and i created a lot of new categories for my parts... I've made the old category pages (which have had their content removed) "hidden" to anyone who visits the site and starts browsing.  The only way you could get to those "hidden" pages is either by knowing the URLS that I used to use or if for some reason one of them is spidering in Google. Since I'm trying to clean up the site and get rid of any duplicate content issues, would i be better served by adding those "hidden" pages that don't have much or any content to the Robots.txt file or should i just De-activate them so now even if you type the old URL you will get a 404 page... In this case, are 404 pages bad?  You're typically not going to find those pages in the SERPS so the only way you'd land on these 404 pages is to know the old url i was using that has been disabled. Please let me know if you guys think i should be 404'ing them or adding them to Robots.txt Thanks

                    Technical SEO | | Prime85
                    0
                  • suskanchan

                    How to SEO a Website Built off Godaddy?

                    I have a client whose website is built off Godaddy services. I know Godaddy is not the right choice for building a website, but what's done is done. The client has already bought the Godaddy services and there's no way I can tell him to go rebuild his website before we could optimize it for SEO. I'm already facing a lot of challenges while optimizing on-page elements. When I wanted to verify the ownership for Google Analytics and Webmaster Tool via his Godaddy account. the process failed many times. it looks like Godaddy is using some kind of caching not allowing us to modify the codes. For example, I'd applied the site verification codes for Webmasters Tool 48 hours ago, and the metatag for google site verification is not yet updated in the frontend. It's quite frustrating. What would you suggest?

                    Technical SEO | | suskanchan
                    1

                  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.