Invisible on page factors are the part of webpage which are not visible to the human readers. They can be read,however, by a search engine parsing a website.
Invisible page factors include.
- Meta Description
- Meta Keywords
- Alt and title attributes
- Page structure consideration
META DESCRIPTION
For the most part, the important of a meta description lies in the fact that search engine may choose to use it in the SERPs, instead of displaying relevant bits from the page. Speaking from marketing point of view, this may improve CTR. It may also have a minor effect on search engine ranking, but it is not a critical factor in that regard.
META KEYWORDS
This criterion is widely regarded as totally unimportant because it is completely invisible and subject to manipulation. It is wise to place a few major keywords as well as their misspellings in the meta keywords tag, but effectiveness of targeting misspellings this way has been disputed.
ALT AND TITLE ATTRIBUTES
Because these tags are mostly invisible, they are likely not an important ranking factor. Many assert that their value is higher on hyperlink images. They are important, however, for screen readers and text-based borders.. that is, for accessibility and usability in general, so they should not be ignored for that reason alone. This is a case where accessibility, usability and search engine optimization coincide. The description should be short, Keyword stuffing in an alt tag will irk blind users using screen readers, and possibly “irk” the search engine as well. Alt tags can only be used in image tags, where as title attributes can be used in most tags.
PAGE STRUCTURE CONSIDERATION
Search engine use block-level elements, for example “<div>”,”<p>”, or “<table>” elements to group related text. Using block-level elements indiscriminately for layout, as illustrated in the following example, may be harmful:
“<div>Dog</div>
<div>food</div> is likely to be less relevant than:
<div>dog food</div>”
