Ιt is very difficult to notice such a change.
MAKE LINKED JAVASCRIPT FILE SECURE CODE
Hackers don't want to get noticed, and so most probably they will leave the slider's code as is -in order the sliders on the sites they use it to keep working- and add malicious code at the end of the file. The same can happen by a third person if is hacked. The owner of can any time change the contents of the js file or add something extra in the file irrelevant to the slider functionality. In case the other domain is closed you will have an additional problem to find the js file your slider needs in order to work. The slider will stop working and you will struggle to understand why this happens. The whole might even completely close as a site.
The owner of can any time delete, rename, or move the javascript file to which you have a link. This is valid for any file type, images, javascript, css, etc. The local files get loaded faster than the external ones. If you pay attention to the bottom line of your web browser (eg Firefox) when you visit a page it shows you the files it loads. For each file the browser makes a request to the web server in order to load it. A web-page is consisted by many files (images, videos, javascript, etc). The web browser takes more time to load files from external sites as it queries third sites which make page loading slower. This is valid for google, microsoft, and any other site you think will be online forever.
Even if our site is fine and online the script wont work and the slider will break just because some other, irrelevant, site is down. If the domain in which the file is located ( ) is down, or for some reason not-available (eg due to routing issues of the internet provider), then our script wont work because the external js file wont be loaded.
Let's see what problems may arise to our site by just the fact that it is an external file. Consider we have an image slider using jquery and we use an external javascript file /slider.js in order for the slider to work in our site.
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