I'm trying to reduce the size of my CSS file. It is from a template which is very CSS & JS heavy. Even with CSSMin the CSS file size is 250kb.
Whilst I use alot of the CSS - I know I dont use it all. So I'm trying to work out which styles can be removed. I'm aware of Dust-Me selector - but that only takes a static look at the website. With HTML5 and CSS3 - websites are now very dynamic, and most of my CSS occurs from dynamic events, or 'responsive' events i.e. Bootstrap.
Question: Is there a tool which 'records' all my CSS use on a website for a perioid of time, so I can go and click/hover/move over each element and interact with my site. Then at the end let me know which styles were & were not used?
CSS Usage is a great extension for firefox. It tells which css are currently used in a page.
Link: https://addons.mozilla.org/en-us/firefox/addon/css-usage/
There are two tools that I think might help you out.
helium is a javascript tool that will discover any unused css rules.
csscss is a source code analyzer that will report any duplication. I'm biased because I wrote csscss precisely because I couldn't find anything that did this. But many people seem to find it useful.
250kb is really such a big figure for just CSS files.
The templates generally have all the CSS required for all the pages in a single file.
I would suggest:
Do not cut your CSS code, they might be needed some point of time.
Instead i would suggest, break your CSS file into number of small files for different page stylings,
such as a different CSS for login page, different CSS file for home page, etc.
Read your own CSS and HTML code vigorously to find out which significant part of CSS code is used in which HTML section.
Update:
You may try Removed Unused CSS - CSS optimizer.
I personally did not use it just hope it works for you.
Related
Currently I'm developing a website using the following stack:
vue.js
#vue/server-renderer
vite
tailwind CSS
SSG was chosen as the rendering mode.
Tailwind, as described in the documentation, allows you to specify directories and file extensions (content property) , in which he will try to find the classes, in order to leave only those that are actually used in the project.
As a result, the 'main.css' file is formed, in which only those classes that are used remain.
Next, I just take this file and include it in every page that was rendered during the build phase of the project.
This results in:
index.html - main.css
about.html - main.css
blog.html - main.css
It turns out that main.css file may contain classes that are needed only for one of the pages and are not needed for others.
I would like to implement the following:
Take main.css which turned out
Render a page, for examle about.html
take only those styles that are needed for about.html page from the main.css file
create a new about.css file
link the resulting about.css styles to about.html
I’ve already tried to implement this using an awesome PurgeCSS tool as following:
render page content usind #vue/server-renderer's renderToString() method;
Pass an resulting css and html sources to PurgeCSS
here is an example
But there are too many corner cases around this solution, such as:
Dynamic classes which can be added to the html on the client side
Some components may be missing in rendered html and their content will be added later (for example, v-if directive was used on the component)
A few takeaways:
PurgeCSS is not needed anymore since Tailwind v2 (the latest being v3.x)
as far as I know, you cannot have code-splitting with Tailwind, not that it matters anyway since it will still perform okay with further optmizations
the classes that will be generated, will be only once for the whole app (hence no need to have a bg-red-500 for index or about page, both are referencing the same unique declaration)
if you want to have SSR/SSG, I recommend the usage of Nuxt (in it's v3 if you're using Vue3 or plan to have anything long-term)
dynamic classes are not possible with Tailwind, you can create things like bg-[#ccc] but it goes on the opposite side of what Tailwind is achieving and should be used exceptionally
for Tailwind's content, still the defaults on this page, section Configure your template paths, no need to do anything crazy or complicated
if you want to have some scoped/local style, style to using style scoped, you can still use Tailwind inside of those tags tho
if you want to write vanilla CSS into dedicated CSS files like index, about, blog etc, then Tailwind is probably not the best approach because this is not how it is supposed to work
stay simple, the performance will still be amazing. Only focus on not having too many screens, colors etc that you're not using
you could run some bundle size tests to see if the CSS is taking a huge chunk in terms of size. Will probably not, but if it still is: you can then start making complex configurations
JS will be far harder to reduce and be more impactful regarding the performance (because of how a browser works with it: parsing, executing is indeed blocking the main thread)
I have question about some CSS stuff. I'm currently using Boostrap to develop a web application. I have come in the situation where I have to set some media queries in my custom css which i use for styling and graphic. My question is will there be any conflict with those one in Boostrap CSS.
With Bootstrap, the best practice is to add your custom CSS code (including media queries) after Bootstrap's styles have been declared. In general, you'll first call the standard Bootstrap CSS file. Next you can call a customized CSS file that you generate, which contains any overrides to the base CSS along with any media queries needed.
You can also minify your CSS files, but make sure to have the base CSS styles appear first in the minified version.
I'm newbie to Bootstrap 3, but I noticed that Bootstrap require Javascript even if it's not necessary, e.g. dropbown menu doesn't work if js is disabled. Is there any good reason to prefer js over CSS?
I think cause Javascript and CSS are different and can't replace each other.
In CSS you can't do for example calculations, DOM manipulation, react on click and other live events. Javascript can't style your HTML, have media queries etc. see also: Performance: Pure CSS vs jQuery
Yes, i know there are alternative for everything, see:
Can I do this in pure CSS instead of using jQuery?, Can I have an onclick effect in CSS?, etc .... but it is not the same.
What's your problem with javascript? in the first place? Do you have some requirements like: "should work with javascript disabled". Should your site work with this requirement or should it be exactly the same. What are you alternatives for javascript disabled? basic CSS? full css3? For me it seems realistic to prevent errors with javascript disabled but not expect all work the same. In the case of a dropdown you could consider a alternative navigation structure.
I have to download CSS file and apply style sheet to my app. I downloaded this file at the local folder and referenced it as
style.href = "ms-appdata:///local/css//custom.css";
and appended to head as
document.getElementsByTagName('head')[0].appendChild(style);
after document onready event.
Seems it has no effect (but I can see this element in the dom browser).
So is there any restriction for css source: app package, local folder? May be this impossible to reference downloaded CSS due to MS limitations? Or may be I'm doing something wrong? Any suggestions?
Do keep in mind, however, that you can access the document.styleSheets collection and list, add, or remove CSS rules dynamically from JavaScript. You can access the individual rules themselves through the DOM using statements like document.styleSheets[0].cssRules[0].style.color = "red" or you if you've fetched yourself some custom CSS text (dynamically from your other CSS file online) you can add its styles to one of your active style sheets using something like document.styleSheets[0].cssText = "{my CSS code}". Do be sure that you're manipulating the right style sheet by checking the document.styleSheets[0].href.
I think you're out of luck trying to head down that path.
Note that, for security reasons, you cannot navigate to
HTML you have downloaded to this location and you cannot
run any executable or potentially executable code, such
as script or CSS.
Source: http://msdn.microsoft.com/en-us/library/windows/apps/hh781215
Also, this blog post seems possibly helpful: http://palermo4.com/post/How-to-Use-IFrames-in-WinRT-Apps.aspx
I want to use pjax in my application and basically have it working, but I can´t figure out how to use it with page-specific JS and CSS code.
I usually have one application-wide and one page-specific JS and CSS file per page.
The only solution I can think of in order to avoid collisions between several page-specific JS files is to manually unbind all page-specific event handlers when loading another page, but this would become super complex, because I would have to unbind all event handlers used in any page-specific code.
For CSS, the solution would be to increase the specificity e.g. by prefixing all selectors with a page-specific ID, which of course is possible, but not the most elegant solution in my opinion.
Has anybody found an elegant solution for using pjax with page-specific JS and CSS files?
I have been working on the CSS and JS including.. I have posted the code to the github pjax page. Take a look Including CSS and JS files via PJAX