Lessons
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Introduction
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SEO
- Snippet CTR
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Indexing
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Headings H1-H6
Images have the alt attribute.
The Title attribute of links
Splitting the page into HTML5 sections
Content robots.txt
Duplicate "title"
Duplicate "description"
Human-understandable name of the picture
Rules for formatting text on a page
Micro-markup format requirements and recommendations
Validation microdata Google
Human-friendly link format
Errors in Robots.txt
The content of the site map
The site map file
Link formatting requirements
Hreflang tag
"canonical" tag
Spelling of interactive interface elements
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Speed
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Number of network requests
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An overabundance of small pictures
Grouping CSS files
Grouping JavaScript files
An overabundance of font files
Redirects when uploading files
Availability of end-to-end CSS, JS files
Uploading duplicate files
Using JavaScript facades
Redirecting JavaScript code
Redirect from/to www version
Using sprite technology
The video player is connected correctly
- General assessment
- Caching
- Showing the first content
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File size
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Minification of CSS to reduce its volume
Server GZip compression function
Minification of the embedded JavaScript code of the page
Acceptable size of the HTML code of the page
Minification of the embedded CSS code of the page
Minification of images without loss of quality
Minification of JavaScript files to reduce its volume
The total size of all images on the page
Unused CSS code
Font Optimization
An overabundance of monochrome icons
The presence of a monochrome font
Data optimization:Image URLs
Animated image format MP4, WEBM, SVG instead of GIF and WEBP
Unused JavaScript code
Cropping monophonic fields in images
Using the WebP format in images
Too high-quality images without using compression
Suitable video bitrate
Excessively large images
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Slow files
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HTML code generation time
Title "Keep alive"
Optimal time to download files from the server
Using the modern HTTP2 protocol to speed up the site
Adding lazy loading
Long JavaScript code execution time
Time to download files from the server under load
The server is located in the same country where the users of the site live
No requests to another country that cause page loading to be blocked
Blocking files
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Number of network requests
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Mobile adaptation
- Broken layout
- Compliance with guidelines
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Software errors
- Code
- Mail operation
- Availability
- Server software
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UX User Experience
- Text readability
- Logic and convenience of the interface
- Visual defects
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Integration with programs
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Phones without a clickable link to start a call quickly
Links for Email addresses
Manifest validation.json with a list of favicons
Snippets of the site when sending links in social networks and instant messengers
Tag for specifying a large favicon
The BrowserConfig file
Apple touch bar icon for Mackbook pro
Favicon.ico file
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Vulnerabilities
- Code
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Server Settings
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Uploading all page files via HTTPS
Strict-https header for increased security
Private access to service files
Encrypted IPv6 connection
Enabled error display in the north
SSL certificate validity
HTTPS Availability
Redirects to protected
Vulnerabilities of a secure SSL connection
HTTP headers for increased security
- Third-party software
Acceptable size of the HTML code of the page
Opening any link in the browser, the first thing the user receives is the HTML code of the page. Its large volume is rarely justified. Large pages not only take a long time to load, but also require a lot of computing resources to display. This slows down the overall page load.
Use delayed loading. For example, in a product profile in an online store, product recommendations can be loaded after the entire page has been loaded. The user will see them in 10 seconds at the earliest when they scroll through the page. Therefore, it makes no sense to load these blocks at once.
You can also use an HTML code minifier. It will remove extra characters like extra spaces, line breaks, comments, etc. But their work can take a long time, so use them only if the code you are optimizing is cached.
Try not to exceed 120 KB of the HTML code of the page.
Comparison of browser processing time of a large and small HTML page:
Demonstration
PHP code
HTML code
<?php
$mode = $_GET['mode'] ?? '';
?><!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
.btn {
color: #000;
display: inline-block;
margin-bottom: 5px;
text-decoration: none;
padding: 5px 10px;
border: 1px solid #000;
border-radius: 5px;
}
.btn:hover {
background-color: #ddd;
}
.btn.active {
background-color: #000;
color: #fff;
}
</style>
<script>
document.addEventListener("DOMContentLoaded", (event) => {
document.querySelector('#page-load').innerHTML = 'Событие DOMContentLoaded выполнилось в <b>'+(performance.now()/1000)+'с</b>.';
});
</script>
</head>
<body style="font-family: sans-serif;">
Режим: <a class="btn <?=$mode === '' ? 'active' : ''?>" href="./over_size_page.php">Файл 1 000 DOM элементов 25 КБ</a> <a class="btn <?=$mode === 'big' ? 'active' : ''?>" href="./over_size_page.php?mode=big">Файл 20 000 DOM элементов 490 КБ</a>
<br />
<p id="page-load">Тут отобразится время вызова события DOMContentLoaded</p>
<?php for($i = 0;$i < ($mode === 'big' ? 10000 : 500); ++$i) { ?>
<div><span><?=$i?></span></div>
<?php } ?>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
.btn {
color: #000;
display: inline-block;
margin-bottom: 5px;
text-decoration: none;
padding: 5px 10px;
border: 1px solid #000;
border-radius: 5px;
}
.btn:hover {
background-color: #ddd;
}
.btn.active {
background-color: #000;
color: #fff;
}
</style>
<script>
document.addEventListener("DOMContentLoaded", (event) => {
document.querySelector('#page-load').innerHTML = 'Событие DOMContentLoaded выполнилось в <b>'+(performance.now()/1000)+'с</b>.';
});
</script>
</head>
<body style="font-family: sans-serif;">
Режим: <a class="btn active" href="./over_size_page.php">Файл 1 000 DOM элементов 25 КБ</a> <a class="btn " href="./over_size_page.php?mode=big">Файл 20 000 DOM элементов 490 КБ</a>
<br />
<p id="page-load">Тут отобразится время вызова события DOMContentLoaded</p>
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<div><span>475</span></div>
<div><span>476</span></div>
<div><span>477</span></div>
<div><span>478</span></div>
<div><span>479</span></div>
<div><span>480</span></div>
<div><span>481</span></div>
<div><span>482</span></div>
<div><span>483</span></div>
<div><span>484</span></div>
<div><span>485</span></div>
<div><span>486</span></div>
<div><span>487</span></div>
<div><span>488</span></div>
<div><span>489</span></div>
<div><span>490</span></div>
<div><span>491</span></div>
<div><span>492</span></div>
<div><span>493</span></div>
<div><span>494</span></div>
<div><span>495</span></div>
<div><span>496</span></div>
<div><span>497</span></div>
<div><span>498</span></div>
<div><span>499</span></div>
</body>
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