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 your brand’s footprint in AI search
      Moz Pro

      Track your brand’s footprint in AI search

      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. Intermediate & Advanced SEO
    4. Is DOCTYPE important for 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.

    Is DOCTYPE important for SEO?

    Intermediate & Advanced SEO
    2
    2
    4827
    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.
    • AdeLewis
      AdeLewis last edited by

      Hello fellow Mozzers.

      I am just having a brief look at a potential clients website before speaking to them tomorrow and whilst looking at the source I noticed that they don't appear to have a clear definition for their Doctype.

      All the have at the top of each page is

      I have to admit that Doctypes aren't my strong point but I know that they are normally slightly more descriptive than this.

      Can this have any effect on rankings? or is this just an issue for W3C validation?

      Thanks 🙂

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

        If it is an HTML 5 page that should be just fine as it is the HTML 5 doctype tag.

        Check out the info here: http://www.w3schools.com/html5/tag_doctype.asp

        It might cause trouble with really old browsers, but if they have that going I would hope they have already thought about the reasons for and against using it 🙂

        EDIT: even better link: http://www.w3.org/TR/html5-diff/#doctype

        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

        • Nobody1616542228134

          Why is pagination SEO such a mystery in 2021?

          Hi folks. I would like to discuss pagination. I use WordPress (Genesis, specifically). I ran my site through a site scan and it flagged an error which told me that my blog was producing duplicate meta descriptions because the  blog is paginated - the same meta description from the blog page is being used on Page 2, Page 3 etc. I looked into this and the Internet is awash with many other people scratching around for a solution. My understanding is that using a canonical link on the first page is not a good idea, because it says to Google that only Page 1 of the blog is important. I also read an article that states Google no longer reads the Rel=Prev/Next code that could be used to tell Google to ignore the issue. So, what's the solution? Do I even need one? As a side-thought, it seems to me that pagination is, well, pretty useless. I mean, if my blog has 20 pages and I've worked hard to create content, who is going to click through to anywhere near page 20? Nobody. There has to be a smarter way for people on-site to access content. I would love your thoughts on all of this. Cheers.

          Intermediate & Advanced SEO | | Nobody1616542228134
          0
        • yaelslater

          Are In-Page Tabs still detrimental to SEO?

          Hi Mozers, Are in-page tabs still detrimental for SEO? In-page tabs: allow you to  alternate between views within the same context, not to navigate to different areas.  As in one long HTML page that just looks like it's divided into different pages via tabs that you can click between. Each tab has it's own URL, which I guess is for analytics tracking purposes? https://XXX https://XXX?qt-staff_profile_tabs=1 https://XXX?qt-staff_profile_tabs=2 https://XXX?qt-staff_profile_tabs=3

          Intermediate & Advanced SEO | | yaelslater
          0
        • Fubra

          Gallery maintenance and the effect on SEO

          Basically we get a lot of users uploading photos as part of their review, but many photos aren't moderated into our pages and therefore are never displayed. Things like selfies rather than photos of the product or just random google images that are completely unrelated to our products or services. Is there any benefit in cleaning up the gallery since some images we don't use are just sat there in admin?
          when a page loads, would it be quicker if we had less content in the gallery? With our SEO hat on.
          or does it not matter since it's not loading that content (photos) anyway?

          Intermediate & Advanced SEO | | Fubra
          0
        • Chris8198

          Lightboxes and SEO

          Do lightboxes (AKA popup boxes when you click "learn more" type CTAs) have any negative effect on SEO? We are looking at revamping our sites to have more of a tiled approach, and a lightbox with summary content popping out with additional CTAs, directing to pages with more information or free trial pages. Is there any downside to this approach from an organic perspective? is there anything specific to keep in mind when creating these if not?

          Intermediate & Advanced SEO | | Chris8198
          0
        • Virginia-Girtz

          Do Page Anchors Affect SEO?

          Hi everyone, I've been researching for the past hour and I cannot find a definitive answer anywhere! Can someone tell me if page anchors affect SEO at all? I have a client that has 9 page anchors on one landing page on their website - which means if you were to scroll through their website, the page is really really long! I always thought that by using page anchors instead of sending users through to a dedicated landing page, ranking for those keywords makes it harder because a search spider will read all the content on that landing page and not know how to rank for individual keywords? Am I wrong? The client in particular sells furniture, so on their landing page they have page anchors that jump the user down to "tables" or "chairs" or "lighting" for example. You can then click on one of the product images listed in that section of the page anchor and go through to an individual product page. Can anyone shed any light on this? Thanks!

          Intermediate & Advanced SEO | | Virginia-Girtz
          1
        • pnb567

          Is .ME domain is effective in SEO ?

          I am always listening about TLD. com. org .net but what about the .me domain. Can this will be effective in SEO. Can i able to beat down my competitors, if i choose .me . I also have a .com or other TLD option but if i am making my name than .me is for me but i need your suggestion for the seo purpose. Is there really domain affective in term of SEO.

          Intermediate & Advanced SEO | | pnb567
          0
        • weebro

          Using WP All Import csv import plugin for wordpress to daily update products on large ecommerce site. Category naming and other issues.

          We have just got an automated solution working to upload about 4000 products daily to our site. We get a CSV file from the wholesalers server each day and the way they have named products and categories is not ideal. Although most of the products remain the same (don't need to be over written) Some will go out of stock or prices may change etc. Problem is we have no control over the csv file so we need to keep the catagories they have given us. Might be able to create new catgories and have products listed under multiple categories? If anyone has used wp all import or has knoledge in this area please let me know. I have plenty more questions but this should start the ball rolling! Thanks in advance mozzers

          Intermediate & Advanced SEO | | weebro
          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

        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 - 2026 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.