in HTML5 which tag or tags embed a web page inside of a web page code example

Example 1: how to set background image for web page in html local image

body {  background-image: url(/path/to/image.png); }

Example 2: javascript get all script tags on page

var scripts = document.getElementsByTagName("script");
for (var i = 0; i < scripts.length; i++) {
  if (scripts[i].src) {
  	console.log(i, scripts[i].src);
  } else { 
    console.log(i, scripts[i].innerHTML);
  }
}