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
The presence of a monochrome font
Monochrome small pictures are ubiquitously used in interfaces. It is better to save these icons in CSS as data URL strings in SVG format, instead of fonts. Firstly, you speed up page loading, as you reduce the number of requests by 1. Secondly, the CSS file is edited as plain text, and a special service or program is needed to edit the font glyph. This saves the programmer time. Using SVG, you can add a drawing of any complexity to the page. Glyph fonts have limited capabilities in terms of graphics.
You can convert SVG to CSS in the service [https://bloggerpilot.com/en/tools/svg-to-css /](https://bloggerpilot.com/en/tools/svg-to-css /).
Compare the appearance and source code when using glyph fonts and data URL SVG images:
Demonstration
HTML code
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
@font-face {
font-family: 'icomoon';
src: url('icomoon.ttf?nf6jl1') format('truetype');
font-weight: normal;
font-style: normal;
font-display: block;
}
[class^="icon-"], [class*=" icon-"] {
/* use !important to prevent issues with browser extensions that change fonts */
font-family: 'icomoon' !important;
speak: never;
font-style: normal;
font-weight: normal;
font-variant: normal;
text-transform: none;
line-height: 1;
/* Better Font Rendering =========== */
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
.icon-droplet:before {
content: "\e90b";
}
.icon-phone:before {
content: "\e942";
}
.icon-clock:before {
content: "\e94e";
}
[class^="svg-"],
[class*=" svg-"] {
width: 40px;
height: 40px;
}
.svg-envelope {
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M19 1H5a5.006 5.006 0 0 0-5 5v12a5.006 5.006 0 0 0 5 5h14a5.006 5.006 0 0 0 5-5V6a5.006 5.006 0 0 0-5-5ZM5 3h14a3 3 0 0 1 2.78 1.887l-7.658 7.659a3.007 3.007 0 0 1-4.244 0L2.22 4.887A3 3 0 0 1 5 3Zm14 18H5a3 3 0 0 1-3-3V7.5l6.464 6.46a5.007 5.007 0 0 0 7.072 0L22 7.5V18a3 3 0 0 1-3 3Z'/%3E%3C/svg%3E");
}
.svg-user {
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 12a6 6 0 1 0-6-6 6.006 6.006 0 0 0 6 6Zm0-10a4 4 0 1 1-4 4 4 4 0 0 1 4-4ZM12 14a9.01 9.01 0 0 0-9 9 1 1 0 0 0 2 0 7 7 0 0 1 14 0 1 1 0 0 0 2 0 9.01 9.01 0 0 0-9-9Z'/%3E%3C/svg%3E");
}
.svg-search {
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='m23.707 22.293-5.969-5.969a10.016 10.016 0 1 0-1.414 1.414l5.969 5.969a1 1 0 0 0 1.414-1.414ZM10 18a8 8 0 1 1 8-8 8.009 8.009 0 0 1-8 8Z'/%3E%3C/svg%3E");
}
</style>
</head>
<body style="font-family: sans-serif;">
<p>Кнопки глиф шрифта.</p>
<div class="icon-droplet"></div>
<div class="icon-phone"></div>
<div class="icon-clock"></div>
<p>Data URL кнопки.</p>
<div class="svg-envelope"></div>
<div class="svg-user"></div>
<div class="svg-search"></div>
</body>
</html>