Invisible content, by contrast, is everything the user does not see, but
which is still important to the page, like metadata, alternative content for images and multimedia
files, and class and ID values.
Search engines consume actual text inside the HTML, so they index the page as the culmination
of visible and invisible content. But while plain HTML text is discernible by both
user and spider, images can be understood only by a human and mean nothing to a
searchbot unless proper alternative content is provided. While internal SEO strategies
revolve around what search engines discern, that content has to first take into consideration
everything people see.
The importance of metadata
Metadata is commonly defined as ???data about data.??? While this is a clever turn of phrase,
it fails to encapsulate the purpose of metadata, which is to accurately describe content
through summarization and unique identification. Just about every kind of digital document
has metadata. Common image files like JPEG and PNG store color profiles, dimensions,
and a thumbnail version. A Microsoft Word document contains page length, author,
date of origination and last modification, word count, and more.
Pages:
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573