I've spend evenings on tuning my backend code to be served faster, yet there's a gap in page loading time that am not familiar with.
Attached an image - please tell me what is happening in highlighted time (between recieving HTML and DOM ready).
What I think it is - maybe it's DOM intself generating? But why so long? Theres like 10 HTML tags in this testing page.
That's my markup:
<!DOCTYPE html>
<html lang="pl">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>#</title>
<meta name="keywords" content="a, b">
<meta name="description" content="cde">
<meta name="geo.region" content="PL">
<meta name="geo.placename" content="Warszawa">
<meta name="geo.position" content="52;21">
<meta name="ICBM" content="52, 21">
<link rel="stylesheet" href="/Css/_global/Style.css">
<!--link rel="shortcut icon" href="/Gfx/_global/favicon.ico" type="image/x-icon">
<link rel="shortcut icon" href="/Gfx/_global/favicon.gif" type="image/x-icon"-->
</head>
<body>
<ul id="bredcrumbs"><li>domain.com</li><li>Home Page</li></ul>
Content
</body>
</html>
The browser is parsing the dom (as warlock notes) but some javascript may run during this process as well. (See JavaScript: DOM load events, execution sequence, and $(document).ready())
As you have seen some browser plugins can essentially inject some scripts which run pre-dom load which may show up in your load times.
The Browser is parsing HTML and creating DOM
Related
My understanding
So my understanding is, if you have a website with the following source:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>HTML 5 Boilerplate</title>
<link rel="stylesheet" href="style.css">
<script src="script-head.js"></script>
</head>
<body>
<img width="400" src="image.jpg" />
<script src="script-closing.js"></script>
</body>
</html>
...the browser will queue the assets to be loaded in the following order (the order they appear in the page source):
style.css
script-head.js
image.jpg
script-closing.js
I have tested this simple HTML page in Chrome Dev Tools Network tab and the assets do load in that order.
All makes sense to me. So far so good.
The confusion
But in practice, I'm working on optimising the Largest Contentful Paint score of a website (if at all relevant, though I don't know how/why if we are just talking about page load, it's a Shopify website...). So I need to load the largest image on the screen quickly. And the loading isn't happening as I expect.
If we take this site as an example (this is not actually the site I am working on, but it seems to be happening on all the "larger" sites I've assessed. This one is Shopify too): https://www.luxyhair.com/
It has images (eg. //cdn.shopify.com/s/files/1/0066/0052/files/Homepage-Hero_1x1_Cool-Dark-Brown-Balayage_800x.jpg?v=1632412052) that are queued in the Network tab after JS scripts that are below it in the page source (eg. //cdn.shopify.com/s/files/1/0066/0052/t/207/assets/theme.min.js?v=18003517125669543370).
I'm not sure why this is happening.
<!doctype html>
<html lang="en">
<head>
....
<link href="//cdn.shopify.com/s/files/1/0066/0052/t/207/assets/theme.min.css?v=10166822434284191108" rel="stylesheet" type="text/css" media="all" />
....
</head>
<body class="theme-index">
....
<img class="one-whole" src="//cdn.shopify.com/s/files/1/0066/0052/files/Homepage-Hero_1x1_Cool-Dark-Brown-Balayage_800x.jpg?v=1632412052" alt="" />
....
<script src="//cdn.shopify.com/s/files/1/0066/0052/t/207/assets/theme.min.js?v=18003517125669543370" type="text/javascript"></script>
....
</body>
</html>
My fundamental confusion here is why the browser is queuing assets not in the order they are listed in the HTML source.
How I can get an image to load before a bunch of JS scripts that are in the footer that aren't as important? I know about <link rel="preload"> but I can't use that as the image is defined in a page section that's not available for me to capture until after the <head> of the page (because of how Shopify's section templating engine works). I've tried inserting a <link rel="preload"> into the with an inline script, but as expected that hasn't worked. I have also tried adding importance="high" on the img tag. That also hasn't worked.
I am making a simple website redirect page to redirect to twitter but have it as a web app on my iphone. It seems like the meta name tag dosent work or something, because the page has no title and i would like it to say twitter.Can anyone help me? Sorry if im not using the correct terminology as i just got into html and im 15. thanks. Below is the code i have for my page, i have the meta tag in there but it seems like its not working.
<!DOCTYPE html>
<html>
<head>
<link rel="apple-touch-icon" href="http://bkenterprises.neocities.org/twitters.png" />
<link rel="shortcut icon" href="http://bkenterprises.neocities.org/twitters.png" />
<meta http-equiv="Refresh"
<meta http-equiv="refresh" content="0; url=http://www.twitter.com" />
<meta content="name="Twitter" />
</head>
<html>
I am assuming
<meta content="name="Twitter" />
should be:
<meta content-name="Twitter" />
or:
<meta content="Twitter" name="Idontknow" />
I'm also assuming <meta http-equiv="Refresh" is just a cut 'n paste error. If not, remove it.
The meta tag is used to provide data about your HTML file, what you want to use is
<title></title> This has to be within your head tags, they are used like this
<title>Example</title> This will create the title on your page tab, for extra touches you can also use <link rel="shortcut icon" href="Your link"/> If you want the small image next to your title
I'm working on creating Responsive web page using HTML5. Inside HTML5 Head tag, I've title, meta and link tags, is there any recommended best practice for sequencing these tags to get best possible results ? Current structure of the my page is mentioned below.
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; minimum-scale=1.0; user-saleable=false;"/>
<meta name="HandheldFriendly" content="True">
<meta name="apple-mobile-web-app-capable" content="yes"/>
<meta name="apple-mobile-web-app-status-bar-style" content="black"/>
<title>Demo</title>
<link rel="stylesheet" href="/style.css" type="text/css"/>
<link rel="icon" href="/favicon.ico" type="image/x-icon" />
</head>
<body style="margin: 0px;">
Content
</body>
</html>
Can you please suggest, if there is any best practice I need to follow, to utilize HTML5 in best possible way for responsive page design?
It seems ok but:
Responsive web design has nothing whatsoever to do with HTML5.
You shouldn't set maximum-scale nor user-scaleable (which you've got a typo in) to false as the user should be able to scale and zoom in if they want/need to.
Remove the xmlns stuff, it's not needed.
Don't use inline styles in elements, it's not good practice.
This library is very useful to design responsive template
http://getbootstrap.com/
I have an odd problem I've never seen before - linked stylesheets and javascript files appearing inline when I browse the source of a page. It only happens online and not in my local development machine.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<link href="css/bootstrap.css" rel="stylesheet" type="text/css" />
<link href="css/extend-bootstrap.css" rel="stylesheet" type="text/css" />
<link href="css/bootstrap-responsive.css" rel="stylesheet" type="text/css"/ >
and so on becomes this kind of thing:
<!DOCTYPE html><html lang="en"><script src="http://1.2.3.4/bmi-int-js/bmi.js?version=1363970337" language="javascript"></script><head><meta charset="utf-8"><title>Pagetitle</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="description" content=""><meta name="author" content=""><style type="text/css" style="display:none">/**/.clearfix{*zoom:1;}.clearfix:before,.clearfix:after{display:table;content:"";line-height:0;}.clearfix:after{clear:both;}.hide-text{font:0/0 a;color:transparent;text-shadow:none;background-color:transparent;border:0;}.input-block-level{display:block;width:100%;min-height:30px;-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;}article,aside,details,figcaption,figure,footer,header,hgroup,nav,section{display:block;}audio,canvas,video{display:inline-block;*display:inline;*zoom:1;}audio:not([controls]){display:none;}html{font-size:100%;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%;}a:focus{outline:thin dotted #333;outline:5px auto -webkit-focus-ring-color;outline-offset:-2px;}a:hover,a:active{outline:0
and it goes on.
Anyone any thoughts on why this would be happening?
Thanks.
DS
Do you have any compressing software on the server? If you save the page, does it also comes out as 1 line? Maybe it is a setting in your browser.
If you're using IE, browser tools being enabled would cause this.
This is likely a duplicate post of CSS and JavaScript appearing inline in sourcecode
Google Chrome Audit tool says:
Put CSS in the document head (3) CSS in the document body adversely
impacts rendering performance. Link node bootstrap-extract.css should
be moved to the document head Link node style.css should be moved to
the document head Link node css should be moved to the document head
But the stylesheets are linked in the head. Here is the code:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" dir="ltr" lang="fr-FR" xml:lang="fr-FR">
<head>
<title>site</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link rel="stylesheet" type="text/css" href="/resources/css/bootstrap-extract.css">
<link rel="stylesheet" type="text/css" href="/resources/css/style.css">
<link href='http://fonts.googleapis.com/css?family=Lato:300,400,700,900,300italic,400italic,700italic,900italic' rel='stylesheet' type='text/css'>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
etc.
What am I missing?
Your code looks like it should be valid to me, however, the meta tag shouldn't be closed with />:
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
This could cause the <head> tag to close, but that's very unlikely.
Have you looked at the HTML in Google Chrome to see how it is being displayed in comparison with what the code should look like?