When it comes to including external javascript and CSS files, is there a noticeable difference compared to including all javascript and CSS files (including jQuery core) directly within the HTML file using <style>...</style> and <script>...</script> tags? Is there any impact on performance or behavior other than caching? (I am planning to work with this HTML file locally, so caching is not a concern)
One key distinction is that your browser avoids sending those additional requests, leading to the inability to cache them individually from the main page.
Overall, once the resources are successfully fetched, there is virtually no disparity in terms of functionality.
One of the main reasons why external paths are commonly used for CSS and JavaScript is because they are often stored on a CDN or cache server in the cloud.
A great example of this is when including jQuery from Google.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
In this case, Google is hosting it for us, eliminating the need for us to worry about maintenance.
If you prefer to keep these files locally, then you will need to handle maintenance yourself.
Once the code is loaded, there is no difference. While it may not be cached as you mentioned, since it is only needed locally, it is not a major concern.
It is important to ensure that dependency chains are not broken, as the browser will load the scripts simultaneously.
Update: Keep in mind that your main page may take longer to load as it needs to download the additional content before the <body> is loaded. To avoid this, consider moving your JavaScript towards the bottom, close to the footer.
When your CSS doesn't load right away, your website may look unprofessional initially until the styles are applied. To avoid this, it's important to declare your CSS at the top of the page to allow the browser to process it before rendering the page. This may result in a slower initial load time, but subsequent page views will be faster due to caching.
Similarly, for your script code, you must wait for it to be rendered on the page and then for the execution inside $(document).ready(). Without caching, this may cause delays in the execution of your scripts. It's important to consider optimizing your code for faster loading times.
This code snippet is presenting a major performance concern. The load and DOMContentLoaded events will be triggered much slower than expected.
When the load event is triggered, the browser will wait until the last line of code is parsed before moving forward. This will result in a loading circle until all resources are downloaded and processed. Browsers typically load resources in a synchronous manner, which means including JS and CSS within the HTML code will eliminate any potential performance benefits.
There is no noticeable change on the user side, except for quicker loading times due to fewer requests. However, it also means that you won't be able to cache the content or share styles and JavaScript across multiple pages.
If you are confident that the CSS and JavaScript will only be utilized on this particular page, then using inline styles is acceptable in my opinion.
If you want to optimize your website's performance, consider whether to include your script and css files directly in the html or as external files. If they are only used on one page, it might be faster to include them in the html to reduce the number of requests. However, if they are used on multiple pages, it is better to make them external so they can be cached by the browser. Utilizing resources like jQuery from Google can further enhance performance by leveraging cached files from other sites. In practice, it is rare to only use scripts and css on a single page, so separating them externally is usually the best approach for both performance and maintenance. Personally, I always keep my HTML, js, and css files strictly separate!
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