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Valeri Tandilashvili's Personal Professional Blog
Results: 1022
em CODE
Relative to the font-size of the parent element (2em means 2 times the size of the parent font-size). We should be careful when we use 
em
because if we have 3 containers nested inside of each other with 
2em
, then the child element will have 8 times more font-size than it's grand parent container (it means they cascade) 
https://www.w3schools.com/cssref/tryit.asp?filename=trycss_unit_em
https://youtu.be/-GR52czEd-0?t=279
vw CODE
Relative to 1% of the width of the viewport. If our browser viewport is set to 1,000 x 1,200 pixels, then:
1.5vw = 15px font size
1.5vh = 18px font size
1.5vmin = min(1.5vw, 1.5vh) = 15px font size
implementing a fallback for viewport units 
h1 {
    height: 500px;
    height: 100vh;
}
call JavaScript function using href attribute of <a> 
<a href="javascript:get_next_10();">some link</a>
font-weight CODE
100, 200, 300, 400, 500, 600, 700, 800, 900 Defines from thin to thick characters. 400 is the same as normal, and 700 is the same as bold. In earlier versions of the font-weight specification, the property accepts only keyword values and the numeric values 100, 200, 300, 400, 500, 600, 700, 800, and 900; non-variable fonts can only really make use of these set values, although fine-grained values (e.g. 451) will be translated to one of these values for non-variable fonts using the Fallback weights system
date format: yyyy-mm-dd
MySQL:
SELECT CONVERT(varchar, getdate(), 23)
MSSQL:
SELECT DATE_FORMAT(curdate(), "%Y-%m-%d");
property "font-family" 
h1 { font-family: Arial, Helvetica, sans-serif; }
The 
font-family
property should hold several font names as a "fallback" system, to ensure maximum compatibility between browsers/operating systems. If the browser does not support the first font, it tries the next font. Start with the font you want, and end with a generic family, to let the browser pick a similar font in the generic family, if no other fonts are available
tags: thead, tfoot
These tags are used to style its content differently
tag "article" 
<header>
and 
<footer>
elements can be used in 
<article>
. Example: 
<article>
    <header>
        <h2>some header</h2>
    </header>
    <p> some paragraph</p>
    <p> some other paragraph</p>
    <footer>
        written by Quentin Watt
    </footer>
</article>
Warning: The type attribute for the style element is not needed and should be omitted 
<style type="text/css">
Results: 1022