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.

      Track AI Overviews in Keyword Research
      Moz Pro

      Track AI Overviews in Keyword Research

      Try it free!
    • 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. Intermediate & Advanced SEO
    4. How does badly formatted HTML affect 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 does badly formatted HTML affect SEO?

    Intermediate & Advanced SEO
    4
    5
    1762
    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.
    • OptiBacUK
      OptiBacUK last edited by

      Our website uses a custom built CMS, but uses a fairly standard WYSIWYG text editor.

      I've looked at some of the code it produces, and it's not pretty. My gut feeling tells me that this extra bloat is bad for SEO.

      Am I right in thinking that Google doesn't look kindly upon badly formatted and bloated HTML?

      Thanks,
      James

      1 Reply Last reply Reply Quote 0
      • OptiBacUK
        OptiBacUK @CMC-SD last edited by

        Great, thanks for the info. I always thought Google was really hot on compliance, but good to know there is a bit of leeway.

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

          James, You might also want to look at the cached version of your page and then click on Text-only version and see if it shows up correctly. If it does, no need to worry from that perspective, but definitely worth checking from a usability, accessibility etc.

          1 Reply Last reply Reply Quote 1
          • CMC-SD
            CMC-SD last edited by

            The main concern is whether or not the spider can read the HTML. If something's broken, the spider may get confused. It's a good idea to check the site's W3C compliance and correct what you can, but I'm certain the search engines don't ding you if you're not perfectly compliant.

            The real problems with bad HTML are load times and cross-browser compatibility. (Although, frankly, great HTML can have cross-browser compatibility issues, since IE still refuses to get with the program.) Make sure the site looks good in all major browsers.

            OptiBacUK 1 Reply Last reply Reply Quote 2
            • Matt-Williamson
              Matt-Williamson last edited by

              As long as the code produced is readable in a web browser then it being bloated shouldn't have much of an impact in terms of SEO. The code bloats only downside is that it might slow the page load which will have impact on SEO. Remember crawlers like Google bot essentially look at the page content in terms of textual content, what labels (alt tags etc), images and links are on there not how neatly it is presented or whether it is valid markup or not. I would take a look at your page speed otherwise I would worry as long as it is able to fulfil all the basic on page requirements such as headers, page titles etc.

              Just to reiterate this - I have worked with CMS driven sites that aren't W3C compliant and don't produce the nicest html, but have loaded fast and ranked in the top 3 for competitive terms.

              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

              • angelamaemae

                Kind of duplicate categories and custom taxonomy. Necessary, but bad for SEO?

                Hello Everyone! I'm new here! My husband and I are working on creating a website: https://sacwellness.com .The site is an online therapist directory for the the Sacramento California area. Our problem is this: In wordpress our category system is being used for blog posts. Our theme is using a custom taxonomy system to categorize different therapist specialties, therapeutic approaches, etc. We've found ourselves in a position where our custom taxonomy and categories are near duplicates. for example we have the blog categories: ADHD counseling, Anxiety therapy, and Career counseling our corresponding custom taxonomy/therapist categories are: ADHD, Anxiety, and....(oops) career counseling. My understanding is that google doesn't see a difference between identically named categories and custom taxonomies and will so choose one to rank and disregard the other, effectively leaving you competing against yourself. is this true in a case like this? Can google maybe understand the difference because of the custom taxonomy and/or URL paths? if this is a problem is it ok to have near duplicates....like ADHD vs. ADHD counseling. This has been our solution so far....but now we're questioning it....derp x_x. I thought about tagging the categories with no index, but I think the archive pages would be useful for people. Essentially we have 2 sets of archives for each keyword. One is for blog posts, and one is for therapists who work with that particular issue along with the 6 most recent blog posts in that category.....because we are putting the 6 most recent blog posts at the bottom of the therapist pages I feel like it wouldn't be as terrible of a loss if we had to noindex the category pages. ....what do you think? Thank you!

                Intermediate & Advanced SEO | | angelamaemae
                0
              • FashionLux

                AJAX requests and implication for SEO

                Hi, I got a question in regard to webpages being served via AJAX request as I couldn't find a definitive answer in regard to an issue we currently face: When visitors on our site select a facet on a Listing Page, the site doesn't fully reload. As a consequence only certain tags of the content (H1, description,..) are updated, while other tags like canonical URLs, meta noindex,nofollow tag, or the title tag are not updating as long as you don't refresh the page. We have no information about how this will be crawled and indexed yet but I was wondering if anyone of you knows, how this will impact SEO?

                Intermediate & Advanced SEO | | FashionLux
                0
              • monali123

                How to detect a bad link and remove ?

                As per google penguin, all the low quality back links are going to affect the website SERPS hugely. So, we need to find all the bad back links and then remove them one by one. What I would like to know is, what tool do you use to find all the bad back links ? And how do we know which is a bad back link or bad website, where our link should not be there ? Then what service what do you suggest for back links removal. I contacted LinkDelete.com and they quoted me 97$ for a month to remove all links in less than 3 weeks. 
                Let me know, what you suggest.

                Intermediate & Advanced SEO | | monali123
                0
              • Thos003

                Server Migration, Does it effect SEO?

                About to go through a server migration. My intitial thought is that a change in servers shouldn't really change my rankings. But I've heard rumors... Can a server migration change rankings? Why?

                Intermediate & Advanced SEO | | Thos003
                0
              • MangoMan16

                Changing Servers + Effect on SEO

                Hi, I am currently with a very slow server. Our website takes quite a while to load, FTP is very slow and content changes with Wordpress are slow because even the database connection takes a lot of time. However, my website ranks very well. Traffic has doubled in the last year. Our domain has been registered with this company for over 10 years. I am wondering if changing to a different hosting provider would have an effect on my rankings due to the change in IP.

                Intermediate & Advanced SEO | | MangoMan16
                0
              • kashyaplakkad

                What should I cover in a SEO proposal ?

                What should I cover in a SEO proposal? Is there any sample SEO Proposal template in SEOMoz?

                Intermediate & Advanced SEO | | kashyaplakkad
                1
              • attorney

                Are dropdown menus bad for SEO

                I have an ecommerce shop here: http://m00.biz/UHuGGC I've added a submenu for each major category and subcategory of items for sale. There are over 60 categories on that submenu. I've heard that loading this (and the number of links) before the content is very bad for SEO. Some will place the menu below the content and use absolute positioning to put the menu where it currently is now. It's a bit ridiculous in doing things backwards and wondering if search engines really don't understand. So the question is twofold: (1) Are the links better in a bottom loading sidemenu where they are now? (2) Given the number of links (about 80 in total with all categories and subcategories), is it bad to have the sidemenu show the subcategories which, in this instance, are somewhat important? Should I just go for the drilldown, e.g. show only categories and then show subcategories after? Truth is that users probably would prefer the dropdown with all the categories and second level subcategories, despite the link number and placement.

                Intermediate & Advanced SEO | | attorney
                1
              • MyNet

                How To 301 Redirect .html pages

                I need to redirect a page/URL that is purely .html to a new location.  I don't know how to do this.  All the redirects I can find are for server side code pages .php/.aspx etc.  From my understanding I can't put a server side redirect in a .html file.  I am hosting on a microsoft server, however the new page I am redirecting to is .php.  I am running some WordPress (.php) files on the server.  I need to make it redirect before the old page loads so visitors don't start reading something that is about to get redirected Can someone please help me?

                Intermediate & Advanced SEO | | MyNet
                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.