allowtransparency="true" : This attribute allows the iframe to be transparent, which can affect how backgrounds and borders are displayed in some browsers.
With a few swift keystrokes, Alex pasted the code into a blank HTML page and opened it in a web browser. The page loaded, and suddenly, a sleek and seductive video player appeared on the screen.
An Examination of the Security Implications of Using iFrames with External Sources: A Case Study of YouJizz Embeds
When it comes to the iframe code itself, here are a few things to note: