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 main navigation is using JS, will this have a negative impact on SEO?
-
Hi mozzers,
We just redesigned our homepage and discovered that our main nav is using JS and when disabling JS, no main nav links was showing up. Is this still considered bad practice for SEO? https://cl.ly/14ccf2509478
thanks
-
Thanks Jose!
-
Googlebot does not render JavaScript
We hear very often about JavaScript rendering is the assumption that the crawler is responsible for the rendering. But that's not the case. The rendering is done by the indexer (from Google Caffeine).More specifically, the Web Rendering Service (WRS), which is part of Google Caffeine. And this is exactly where the second great difficulty lies in the area of JavaScript SEO.
Gary Illyes says: "Also, to clarify, WRS is a subsystem of Caffeine, just like the PageRanker (cos yes, we still use it) or the canonicalization algorithm."
The process flow between the crawler and the indexer:
HTML files are downloaded.
CSS and JavaScript data will be downloaded in parallel.
WRS (Web Rendering Service) (part of Google Caffeine) is used to run JS.
WRS renders all files.
Now Google Caffeine can index the content if necessary.
And that's when Googlebot can crawl new links.
Why is that a problem? For the crawler to be able to enter the content and follow the links, it must first pass the data to the indexer. The indexer renders the content and returns it to the crawlers. Only now can the crawler see the content and follow the links. On the next page, the game starts again. Page by page. (many processes)Unlike conventional pages, where the crawler crawls numerous pages and, after crawling, passes everything collectively to the indexer. (few processes)
This process presents another challenge to search engines.
Regards
-
The only bad SEO Practice regarding JS that I've of is trying to hide the JS files from Search Engines, apparently, Google needs to render a whole page as it indexing it; so blocking any JS (& CSS for that matter) isn't a good thing.
-
Hi There,
JS rendered UI isn't negative, it is however not a good practice also.
You can find complete information to the concept of JS rendered pages and UI on this link, https://www.portent.com/blog/seo/javascript-bad-for-seo.htm .
I hope this helps.
Regards,
Vijay
Got a burning SEO question?
Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.
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.
Related Questions
-
Translating meta tags using WPML and AIO SEO
Having a heck of a time finding info on this one... We're working on a multilingual website which uses WPML. I've used the All in One SEO plugin to customize meta data (title, description, etc). These strings do not appear in the list of translations in WPML. Does anyone have any experience with this setup? How do you enable WPML to translate meta data set via the AIO plugin? Thanks!
Intermediate & Advanced SEO | | jonmc0 -
Merging Pages and SEO
Hi, We are redesigning our website the following way: Before: Page A with Content A, Page B with Content B, Page C with Content C, etc
Intermediate & Advanced SEO | | viatrading1
e.g. one page for each Customer Returns, Overstocks, Master Case, etc
Now: Page D with content A + B + C etc.
e.g. one long page containing all Product Conditions, one after the other So we are merging multiples pages into one.
What is the best way to do so, so we don't lose traffic? (or we lose the minimum possible) e.g. should we 301 Redirect A/B/C to D...?
Is it likely that we lose significant traffic with this change? Thank you,0 -
CDN for SEO (or not)?
Does CDN impact on SEO or not? There seems conflicting ideas as to whether they impact positively or negatively, I realise that if the page loads quicker this is a good thing for SEO and usability of course. Does Google see CDN as just cheating and a get-around for not doing the work from the ground up and using good hosting etc? Do you have any direct experience? All constructive input much appreciated!
Intermediate & Advanced SEO | | seoman101 -
Using a US CDN (Cloudflare) for a UK Site. Should I use a UK Based CDN as it says my server is based in USA
Hi All, We are a UK Company with Uk customers only and use CloudFlare CND. Our Site is hosted by a UK company with servers here but from looking online and checking where my site is hosted etc etc , some sites are telling me the name of our UK Hosted company and other sites are telling me my site is hosted in San Fran (USA) , where I presume the Cloudflare is based. I know Cloudflare has a couple of servers in the UK it uses but given all my customers are UK based ,I don't want this is affect rankings etc , as I thought it was a ranking benefit to be hosted in the country you are based. Is there any issue with this and should I change or is google clever enough to know so i shouldn't worry. thanks Pet
Intermediate & Advanced SEO | | PeteC120 -
Domain name suffix impact on SEO
Hello there, We are about to launch a new website and were wondering what impact a specific suffix would have from an SEO point of view. We were thinking about going for a domain which ends in .london as oppose to .com We are based in London and sell world wide via our website. We are suggesting www.domain.london as oppose to www.domain.com I would appreciate your views... Thanks
Intermediate & Advanced SEO | | roberthseo0 -
How does the use of Dynamic meta tags effect SEO?
I'm evaluating a new client site which was built buy another design firm. My question is they are dynamically creating meta tags and I'm concerned that it is hurting their SEO. When I view the page source this is what I see. <meta name="<a class="attribute-value">keywords</a>" id="<a class="attribute-value">keywordsGoHere</a>" content="" /> <meta name="<a class="attribute-value">description</a>" id="<a class="attribute-value">descriptionGoesHere</a>" content="" /> <title id="<a class="attribute-value">titleGoesHere</a>">title> To me it looks like the tags are not being added to the page, however the title is showing when you view it in a browser and if use a spider view tool, it sees the title. I'm guess it is being called from a DB. So I'm a little concerned though that the search engines are not really seeing the title and description. I'm not worried about the keywords tag. Can anyone shed some light on how this might work? Why it might not being showing the text for the description in the page code and if that will hurt SEO? Thanks for the help!
Intermediate & Advanced SEO | | BbeS0 -
Is DOCTYPE important for SEO?
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 🙂
Intermediate & Advanced SEO | | AdeLewis0 -
Will using a service such as Akamai impact on rankings?
Howdy 🙂 My client has a .com site they are looking at hosting via Akamai - they have offices in various locations, e.g UK, US, AU, RU & in some Asian countries. If they used Akamai, would the best approach be to set up seperate sites per country: .co.uk .com .com.au .ru .sg etc Although my understanding is that Googlebot is located in the US so if it crawled any of those sites it would always get a US IP address? So is the answer perhaps to go with Akamai for the .com only which should target the US market and use different / seperate C class hosts for the others? Thanks! Woj
Intermediate & Advanced SEO | | wojkwasi0