I am using insert-CSS node module for adding styles to DOM, internally this adds the embedded approach.
so far my understanding is using external style sheets is best way to do it. But while using insert CSS, css added to the js bundle and dynamically css embedded to the . so this also looks as same using external CSS.. and css will be cached with js and there will be one file(js+css) we can avoid one http request for loading CSS ?
I feel this insert-css is better than traditional approach(external css) am i correct? please suggest me your thought on the same and add some docs to refer.
so my question is which is the best approach among using "insert-css npm" or "external css"
I didn't find useful info on this question and sharing my experience.
My personal recommendation is not to use "insert-css" modules for the simple projects like dealing with forms and minimal amount of components.
"insert-css" - as mentioned above, "insert-css" add the embedded styles, in the network, its passed as base64 format. Though it's less weight in the network, browser needs to convert the base64 format to css and adds the embedded css, this conversion process will happen allays in js side, I guess which will cause the performance issues
Related
I am using google's audit and its tells me to remove unused CSS. I don't know if that css is for just that page or the whole site. The CSS might be there but not needed on that page but another page. Can someone tell me how this works?
It is telling you to remove unneeded CSS for that page.
However you have rightly pointed out the flaw in this suggestion as it only takes into account the current page (in it's initial state, obviously if you have a pop-out menu it won't gather the CSS for that).
Think of it more as a guideline of making sure you don't send the whole of Bootstrap just for the grid and column layouts for example.
Overall this is very difficult to fix, just use the coverage section on the performance tab in Developer tools to make sure you don't have any massively bloated CSS files and you will be fine.
Obviously reduce your unused CSS if it is easy to do so.
The only other thing that this point covers (in it's description, not as part of it's monitoring) is deferring non-essential CSS.
You should defer any Style Sheets that are not required for rendering 'above the fold' content (and inline your 'above the fold' CSS).
This point is also covered in 'Eliminate Render Blocking Resources' so I never quite get why they add the suggestion under this part as well but I have added it for completeness.
I find this rule was good at guiding me when designing a theme from the ground up as it made me seperate global CSS and page CSS more effectively.
Unless your site is scoring 98 / 100 (or you have hundreds of kilobytes of CSS) and you want to squeeze that last little bit of performance out of the site, simply minify and combine your CSS files and ignore this point.
Google's audit tool compares the entire stylesheet against the current URL and then tells you how much of it is actually not used by the browser.
The browser however still needs to download the entire file and then match all CSS selectors that apply to the current URL.
There are many ways to deal with this, but I find it the easiest to use an external API tool like Splitcss that does this for you on URL basis.
If you have only a few URL patterns in your web application, you can use some CLI tools like purgecss or uncss.
I'm trying to reach the best css practice on my website using my own custom css till I found out I can use css framework such as bootstrap or foundation zurb instead. I thought using such framework directly without the need of making my own custom css is possible, but it turns out that all css frameworks are limited to some point yet I need to add extra custom css so my site look the way I want.
I want to use css framework because of the fact that it is being served over CDN so no extra bandwidth, and also for load speed and performance.
now my question, is it possible to be using only css framework on a website without the need of adding a custom css?
also how about creating my own custom css and using #import to a css framework inside the custom file, is that a good practice?
can anyone enlighten me to an efficient method serving a css file with/without css framework to my website?
You can use a plain framework without writing any custom CSS if you either a) Are happy with how it looks without custom CSS or b) like one of the many themes you can get for such frameworks.
You can #import a framework into your own custom CSS - in fact, many frameworks are available as less and importing them allows you to use variables from the framework in your own CSS as well.
As far as efficiency goes, are you sure this is the performance problem you have? If you haven't measured the performance, you aren't ready to optimise! It will, of course, be a straight economic trade-off between looking exactly as you want, and keeping the page load fast.
using a css framework is always a good option. You can use either bootstrap/foundation. along with the various functionalities on the site it would provide u the animation effects as well. And would help to complete the site faster as they provide the snippets of code. You can use less/sass and have the styling customized in the variables so you wont have to include extra custom css file.
Would it be possible to optimize for the critical rendering path (similar to what Google and Facebook are doing) if I am using Bootsrap 3?
Facebook just inlined the styles that are related to the header and sidebars.
Google inlined all the styles because they do not have much styles for the homepage.
The issue here is that let's say I want to inline styles related to my header, it would consist of over 10 classses used from bootstrap (container-fluid, row, col-lg-10, col-lg-offset-2, etc..).
And inlining bootstrap is a bad idea because it is over 100kbs
I want to load above the fold content, really quick.
Is there a smart way of doing it? Do you have any recommendations?
This technique is independent of your framework, Bootstrap in this case.
You have to come up with a way to figure out your critical CSS which you can extract and inline into your HTML file.
There are many ways to do so:
Custom critical CSS file (created manually)
Type annotations in your CSS file, which could be extracted on compile/build time: https://css-tricks.com/annotating-critical-css/
Automated using headless browser like Puppeteer
This topic is way too big to answer in a short thread so feel free to read up on the topics listed above:
https://web.dev/extract-critical-css/
Tools:
Critical
criticalCSS
Penthouse
I wouldn't start doing in-line styles just yet, there are many optimisations that can be done before you'd ever need to go down that route. Plus there is a massive trade off, performance of the duplicated styles in the HTTP request (could be a double edged sword) and a maintenance nightmare.
Load CSS in head.
Load JS at end of body.
Customize bootstrap to only include the minimum required styles.
http://getbootstrap.com/customize/
Bundle & minimize your header related files in a separate bundle, think about segregating bootstrap components. Bundling gives caching and minification.
Single paged application, be smart about your initial load page and use modules/web components to ajax in templates of html.
Use CDN's as there are maximum http connections per host.
More can be found at https://developer.yahoo.com/performance/rules.html
Short answer is that you shouldn't have to add extra inline code for performance reasons. Your best bet to minimize loading time would be (as suggested above) to use the bootstrap customiser to remove whatever classes you won't be needing and also minify and gzip (if possible) before sending. Most of the times you'll need a lot less than the 100kbs bootstrap css.
However, rendering the elements in the browser is more costly than applying classes to them. You can only minimize load times up to a point.
You haven't told us what kind of performance you expect; but if it was a life-or-death kind of situation to super extra fast load the header, yes you should use inline code.
We have a legacy application based on EXT-JS.
We like to add new module into the existing application, using AngularJS and bootsrap.
My problem is that bootstrap’s CSS are conflicting with CSS of the legacy code.
The new module, which written using bootstrap and AngularJS, wrapped around by legacy code, so I need to import exists CSS and new CSS on the same page.
I thought of 2 possible solutions:
Having a prefix to bootstrap’s css file and apply it only to inner part of the page content (AngularJS, new module). The problem is that popup, and angular-bootstrap 3rd party component still interrupted by legacy CSS.
Having my whole inner page (AngularJS module) in separate IFrame, embedded into page that contains the legacy CSS.
It seems like using IFrame solves my problem, but I aware that using IFrame is discouraged, and I am looking for optimal solution for my problem.
Do you think that IFrame is a good practice in this scenario?
Do you have other proven solution?
Planning to use iframes just to get around the css conflicts - not a very good idea. Though iframes can come handy in some cases mostly its usage has been abused just to get around some issues easily.
Do you think that IFrame is a good practice in this scenario?
No. The only issue here is the conflicting css styles between bs and extjs. And planning to use Iframe to get around this is really a bad choice. As you are using angularjs I feel using iframe may restrict its usage to some extent. For instance,embedding it in iframe I think the navigation back and forward buttons wont work as expected, in case your are planning to use angularjs routing. And when using Iframe it will be very hard to debug front end issues.
Do you have other proven solution?
Well I do not have a proven solution but you already have mentioned an idea which may work easily. Bootstrap can be customized to any extent you want to using less variables.
For instance for your issue just namespace the bootstrap styles using less.
.bs {
#import "less/bootstrap.less";
}
And don't get into the mindset using less/sass to compile css is complex. Once you get used to it, this will make this will make FE developement much easier than before.
After many fruitless days of trying to get JQuery Mobile and AngularJS routing to work together, I'm considering my alternative options..
Is there a way to use the JQM CSS without relying on JQuery's javascript?
Or is there a substitute CSS package that are recommended? something with all header/footers and lists that is available in JQM?
Of course, there is an CSS file in the package you downloaded. But all the sites functionality and the mobile adaption will be broken. You can rename the classes and the id's or directly use the classes from the css file.
Greets
There are quite a few jQueryMobile functionalities that rely solely on the CSS fole, eg. the grids. You won't get the interactions, but all the buttons looks, shapes and colors are totally useful without the JS.
Still - depends on your expectations.
And when using it like that you need to understand a bit how JQM works to know the classes and html structure that's expected, because some of these are generated by javascript.
[kind of digression]
But maybe you just dislike how big jquerymobile is?
Then you probably want to use: http://jquerymobile.com/download-builder/ to get only stuff you need, and also use tte themeroller here: http://jquerymobile.com/themeroller/index.php to create only one theme (global) and remove other themes (A,B,C)
That's how you get it a lot smaller.
You can reuse the CSS file inside he downloaded JQM package. The file jquery.mobile-1.x.x.css can be included, but make sure to include the images folder as well and have it at the same location at the destination.
If you aren't sure of which classes to include for which purpose, you can simply find it out by inspecting a JQM demo page to find out (View source will not work due to the JQM javascript).
JQS provides support for ui animations and user experience enhancement. Removing libraries will dispart you from accessing css contents created and used by javascript in order to 'manage' a front-end design. –
Yes you can use jquery mobile theme and adapt it to your needs.
Just reading there was adapter releases for your situation : https://groups.google.com/forum/?fromgroups#!topic/angular/oIxRxpkn3L0
Perhaps substitutes to css packages are documented. About heavier JQM templating and using, there are some introduction to what you'll need to take a look at like adobe theme-control-jquery-mobile.html ..