SEO Validator

SEO 1.1

Definition
- The SEO 1.1 validation was released on 12/10/2007 (dd/mm/yyyy). Latest revision on 12/10/2007 (dd/mm/yyyy).
- Documents which validates as SEO 1.1 must fit following criteria:
  - The URL must be available.
  - The web document must have <meta name="seodoctype" content="1.1" /> declaration within the head part or no definition, otherwise it will be considered as another or older SEO document.
  - The URL must have clear declaration of <head>, <body>, <title> and related closing tags.
  - CSS and JavaScript code must be stored in external files as much as possible. You can call external JavaScript or CSS from (X)HTML document directly.
  - The title tag must be declared.
  - The title must contain reasonable amount of characters. Minimum and maximum is a subject for additional update but it shouldn't be shorter than 3 characters and longer than 220 characters in general.
  - The title must contain more than 2 word and maximum number of words is a subject for validation as well (currently 14). Generally, 10 words are maximum.
  - The title must contain words divided by at least 1 empty space.
  - The title must contain long words. Short words usually have no sense.
  - Each word must not be found too many times in the title. This number is a subject for validation.
  - The meta keywords must be declared and must contain words which can be found within readable content.
  - The meta keywords must contain keywords divided by spaces or commas. A keyword is one word, not a phrase.
  - The meta description must be declared and must contain at least 1 sentence with a dot.
  - The meta description must be of ordinary length (60 - 500) and must not contain one word too many times. Numbers are subject for validation process.
  - Words (1) with maximum presence must be present in the title tag.
  - The page must contain enough unique words (20). This number is a subject for validation, however 25 unique ones are minimum in general.
  - The page must not contain words which can be found too many times within the content (> 0.06). Ordinary text is usually characterised by 5% keyword density.
  - The page must use clear code. Code vs. content ration must not be lower than 25%. This number is a subject for validation (20).
  - The page must contain dots as well as structured sentences. Every natural sentence ends with dot. Number of dots and their presence is a subject for validation (1:100).
  - The (X)HTML code must not contain many tables. This number varies and depends upon used standard (4).
  - The document must contain at least 1 h1 tag with proper content. This content must not be very short or very long (words: 1 - 13).
  - The document must not contain meta refresh tag. This indicates a page as potential spam. However, sometimes it's necessary to use this tag.
  - The document must not contain too many links pointing to internal (55) or external domains (30). An external domain is also a subdomain. These numbers are subjects for validation.
  - Linked images must contain alt attributes. These attributes must have natural looking content and length (words max. : 30). These numbers are subjects for validation.
  - The page must not contain too many links pointing to same URL (max: 20). This number is a subject for used standard.
  - The validator doesn't analyse comments and other content-unrelated objects within the page.
Errors and warnings
- Fatal errors are marked as fatal errors and document with this kind of errors can't validate.
- Warnings are based upon recommendations and they don't affect validation result.
Limitations
- The SEO validator is capable to check HTML and XHTML documents.
- The SEO validator prefers w3 valid documents.
- The SEO validator is capable to detect attributes and values separated with " or ' characters.
- Tentatively valid documents are those which achieves at least 99.9 % in the ranking algorithm.

SEO 1.0

Definition
- The SEO 1.0 validation was released on 19/06/2007 (dd/mm/yyyy). Latest revision on 12/10/2007 (dd/mm/yyyy).
- Documents which validates as SEO 1.0 must fit following criteria:
  - The URL must be available.
  - The web document must have <meta name="seodoctype" content="1.0" /> declaration within the head part, otherwise it will be considered as another type of SEO document.
  - The URL must have clear declaration of <head>, <body>, <title> and related closing tags.
  - CSS and JavaScript code must be stored in external files as much as possible. You can call external JavaScript or CSS from (X)HTML document directly.
  - The title tag must be declared.
  - The title must contain reasonable amount of characters. Minimum and maximum is a subject for additional update but it shouldn't be shorter than 6 characters and longer than 200 characters in general.
  - The title must contain more than 2 word and maximum number of words is a subject for validation as well (currently 10). Generally, 10 words are maximum.
  - The title must contain words divided by at least 1 empty space.
  - The title must contain long words. Short words usually have no sense.
  - Each word must not be found too many times in the title. This number is a subject for validation.
  - The meta keywords must be declared and must contain words which can be found within readable content.
  - The meta keywords must contain keywords divided by spaces or commas. A keyword is one word, not a phrase.
  - The meta description must be declared and must contain at least 1 sentence with a dot.
  - The meta description must be of ordinary length (60 - 500) and must not contain one word too many times. Numbers are subject for validation process.
  - Words (2) with maximum presence must be present in the title tag.
  - The page must contain enough unique words (25). This number is a subject for validation, however 25 unique ones are minimum in general.
  - The page must not contain words which can be found too many times within the content (> 0.05). Ordinary text is usually characterised by 5% keyword density.
  - The page must use clear code. Code vs. content ration must not be lower than 25%. This number is a subject for validation (25).
  - The page must contain dots as well as structured sentences. Every natural sentence ends with dot. Number of dots and their presence is a subject for validation (1:100).
  - The (X)HTML code must not contain many tables. This number varies and depends upon used standard (3).
  - The document must contain at least 1 h1 tag with proper content. This content must not be very short or very long (words: 1 - 10).
  - The document must not contain meta refresh tag. This indicates a page as potential spam. However, sometimes it's necessary to use this tag.
  - The document must not contain too many links pointing to internal (35) or external domains (10). An external domain is also a subdomain. These numbers are subjects for validation.
  - Linked images must contain alt attributes. These attributes must have natural looking content and length (words max. : 20). These numbers are subjects for validation.
  - The page must not contain too many links pointing to same URL (max: 10). This number is a subject for used standard.
  - The validator doesn't analyse comments and other content-unrelated objects within the page.
Errors and warnings
- Fatal errors are marked as fatal errors and document with this kind of errors can't validate.
- Warnings are based upon recommendations and they don't affect validation result.
Limitations
- The SEO validator is capable to check HTML and XHTML documents.
- The SEO validator prefers w3 valid documents.
- The SEO validator is capable to detect attributes and values separated with " or ' characters.