How to display a PDF on the web — Mozilla
The is a very popular option for displaying PDF documents. The was also used in a previous version of Web Tools. HTML5 provides a lot of possibilities by allowing webmasters to display PDF documents using the tag. Here are some ways you can use to display a PDF document.
How to display a PDF in web without HTML5 is not an efficient way of displaying PDFs on web. It could render the PDFs in different formats which causes problems. The main reason is that Web Tools does not support HTML5, and as a result, they display some PDF documents using instead of using the HTML5 format.