Page Attributes
The following elements comprise how the Google interprets specific data about a webpage independent of keywords
Link Popularity within the Site's Internal Link Structure
Refers to the number and importance of internal links pointing to the target page
4     Exceptional Importance
Quality/Relevance of Links to External Sites/Pages
Do links on the page point to high quality, topically-related pages?
3.5   High Importance
Age of Document
Older pages may be perceived as more authoritative while newer pages may be more temporally relevant
3.4    High Importance
Amount of Indexable Text Content
Refers to the literal quantity of visible HTML text on a page
3.2    High Importance
Quality of the Document Content (as measured algorithmically)
Assuming search engines can use text, visual or other analysis methods to determine the validity and value of content, this metric would provide some level of rating
3     High Importance
Organization/Hierarchy of Document Flow (i.e. broad > narrow)
The construction of document text flow - i.e. journalistic style generally dictates a detail-oriented introduction, a broad level overview of the issue and increasing specificity and detail as the article continues.
2.8    Moderate Importance
Frequency of Updates to Page
The number and time frame of changes made to the document over time
2.4   Moderate Importance
Number of Trailing Slashes (/) in URL
1.9    Slight Importance
Accuracy of Spelling & Grammar
The literal correctness of spelling and grammar as related to the language of the document
1.8    Slight Importance
HTML Validation of Document (to W3C Standards)
Validation of HTML page code as per the W3C consortium, an authoritative body on the standards of web-compatible code
1.4     Slight Importance