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dynamic loading, lazy loading, preloading

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Original file line number	Diff line number	Diff line change
`@@ -1074,3 +1074,26 @@ xhr.send();`
`1074`	`1074`	`* sending HTTP response in chunks, browser can deal with this`
`1075`	`1075`	`* possible to send page header first, then page content, the script tags at the bottom`
`1076`	`1076`	`* these can be sent in different chunks, browser will progressively render`
	`1077`	`+`
	`1078`	`+### dynamic script tag example`
	`1079`	`+`
	`1080`	+```js
	`1081`	`+//create script tag`
	`1082`	`+var script = document.createElement('script');`
	`1083`	`+script.src = 'my_script.js';`
	`1084`	`+//append to head`
	`1085`	`+document.documentElement.firstChild.appendChild(script);`
	`1086`	+```
	`1087`	`+`
	`1088`	`+* careful with multiple files (if they depend on each other)`
	`1089`	`+* careful with what you append to (make sure it exists or use the script tag running the append)`
	`1090`	`+`
	`1091`	`+### lazy loading`
	`1092`	`+`
	`1093`	`+* dynamically loading (page-enhancing) JS on page onload`
	`1094`	`+`
	`1095`	`+### preloading`
	`1096`	`+`
	`1097`	`+* dinamically create object tag (to prevent execution)`
	`1098`	`+* set src to js file, and width, height to 0`
	`1099`	`+* next page will get that JS file from cache`

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