All About HTML Canonical Tag Usage
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The document discusses various HTML tags including rel="canonical", rel="next", rel="prev", and hreflang. It explains that rel="canonical" specifies the preferred or definitive URL for a page and helps avoid duplicate content issues. It also discusses using rel="next" and rel="prev" to link pages in a paginated series, and hreflang to provide links to the same page in different languages.
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All About HTML Canonical Tag Usage
- 1. All About HTML Tags Created By: Shalaka Pawar, APM, Search Engine Optimization @Convonix
- 3. http://www.example.com/product.php?item=swedish-fish http://www.example.com/product.php?item =swedish- fish&trackingid=1234&sessionid=5678 http://www.example.com/product.p hp?item=swedish- fish&category=gummy-candy
- 5. Place in the <head> section <link rel="canonical" href="http://www.example.com/product.php?item=swedish-fish" /> http://www.example.com/product.php http://www.example.com/product.p ?item=swedish-fish&category=gummy- hp?item=swedish- candy fish&trackingid=1234&sessionid=5678
- 6. Is rel="canonical" a hint or a directive It's a hint that Google honors strongly. This tag is taken into preference along with other signals Google considers Can I use a relative path to specify the canonical, such as <link rel="canonical" href="product.php?item=swedish-fish" /> Yes, relative paths are recognized as expected with the <link> tag. Also, if you include a <base> link in your document, relative paths will resolve according to the base URL.
- 7. Is it okay if the canonical is not an exact duplicate of the content Slight differences are accepted. E.g. a sort functionality on the page will display different versions of the content What if the rel="canonical" returns a 404 Google will continue to index your content , However its is recommend that you specify existent URLs as canonicals.
- 8. What if the rel="canonical" hasn't yet been indexed Like all public content on the web, Google will discover and crawl a designated canonical URL . As soon as it is indexed, the rel="canonical" hint will be considered. Can rel="canonical" be a redirect Yes, you can specify a URL that redirects as a canonical URL. Google will then process the redirect as usual and try to index it.
- 9. What if I have contradictory rel="canonical" designations Google can follow canonical chains, but its is strongly recommended that you update links to point to a single canonical page to ensure optimal canonicalization results. Can this link tag be used to suggest a canonical URL on a completely different domain The answer is yes! Google now support a cross-domain rel="canonical" link element
- 12. GET /white-paper.pdf HTTP/1.1 Host: www.example.com (...rest of HTTP request headers...) HTTP/1.1 200 OK Content-Type: application/pdf Link: <http://www.example.com/white- paper.html>; rel="canonical" Content-Length: 785710 (... rest of HTTP response headers...)
- 17. On the first page, http://www.example.com/article?story=abc&page=1, you’d include in the<head> section: <link rel="next" href="http://www.example.com/article?story=abc&page=2" /> On the second page, http://www.example.com/article?story=abc&page=2: <link rel="prev" href="http://www.example.com/article?story=abc&page=1" /> <link rel="next" href="http://www.example.com/article?story=abc&page=3" /> On the third page, http://www.example.com/article?story=abc&page=3: <link rel="prev" href="http://www.example.com/article?story=abc&page=2" /> <link rel="next" href="http://www.example.com/article?story=abc&page=4" /> And on the last page, http://www.example.com/article?story=abc&page=4: <link rel="prev" href="http://www.example.com/article?story=abc&page=3" />
- 22. <meta name="syndication- source" content="http://www.publisherX .com/wire_story_1.html"> <meta name="original-source" content="http://www.example.c om/burglary_at_watergate.html "> <link rel="syndication-source" href="http://www.publisherX.com /wire_story_1.html"/>
- 24. <meta http-equiv="content-language" content="en-US"> <meta http-equiv=“content-language" content= "fr"> Language Representation Arabic ar English (United States) en-US English (United Kingdom) en-GB Hindi hi Marathi mr Polish pl Spanish es
- 27. http://en.example.com/javier-lopezeither <link rel="canonical" href="http://es.example.com/javier-lopez" /> http://fr.example.com/javier-lopezeither <link rel="canonical" href="http://es.example.com/javier-lopez" /> http://es.example.com/javier-lopezis <link rel="alternate" hreflang="en" href="http://en.example.com/javier-lopez" /> and <link rel="alternate" hreflang="fr" href="http://fr.example.com/javier- lopez" />
Hinweis der Redaktion
- Importance of HTML Tags like canonical, language & original source tags
- Importance of canonical tags in <a href="http://www.convonix.com/search-engine-optimization/" title="SEO">SEO</a> .
- Two pages with exactly the same content but different URLs
- Place a canonical tags on all the duplicate URLs pointing towards one original URL
- You can identify pages where you need to put canonical tags by carrying out <a href="http://www.convonix.com/seo-services-and-analysis/" title="a complete audit & analysis from a SEO perspective.">a complete audit & analysis from a SEO perspective.</a>
- http://googlewebmastercentral.blogspot.in/2009/02/specify-your-canonical.html
- http://googlewebmastercentral.blogspot.in/2009/02/specify-your-canonical.html
- http://googlewebmastercentral.blogspot.in/2009/02/specify-your-canonical.html
- http://googlewebmastercentral.blogspot.in/2011/06/supporting-relcanonical-http-headers.html
- When we cannot implement a canonical tag on any page (say pdf) we can put it in the header response
- http://googlewebmastercentral.blogspot.in/2011/09/pagination-with-relnext-and-relprev.html
- A paginated series
- In such case – use rel=“next” and rel=“prev”Also put a noindex tag on View all page
- http://googlenewsblog.blogspot.in/2010/11/credit-where-credit-is-due.htmlhttp://support.google.com/news/publisher/bin/answer.py?hl=en&answer=191283
- At times when an article has been syndicated on your website, you can place a syndication tag. If an article has been originally written at your end and original source tag should be placed on the original page pointing toward itself as well as the page the article has been syndicated on pointing towards the original page
- http://www.seroundtable.com/archives/020427.htmlhttp://code.google.com/googleapps/domain/email_settings/developers_guide_protocol.html#GA_email_language_tags
- This tag is used to specify the language, thus targeting a specific region
- http://googlewebmastercentral.blogspot.in/2010/09/unifying-content-under-multilingual.html
- Alternate tags are used when two pages have the same content are in different languages or are targeted for different geographical regions
- In you want only one page of all the languages to be considered by Google, you should have a canonical tag on all the remaining pages