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If you are using Apache as your web server, you can insert this into your .htaccess file:

<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteBase /
  RewriteRule ^index\.html$ - [L]
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d

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// В атрибут value можно передать массив, что позволит выбрать несколько опций в теге select:

<select multiple={true} value={['Б', 'В']}

// Boolean attribute 'multiple' indicates that multiple options can be selected in the list. 
// If it is not specified, then only one option can be selected at a time. When `multiple` is 
// specified, most browsers will show a scrolling list box instead of a single line dropdown.

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// Object with arbitrary string properties (like a hashmap or dictionary)	
{ [key: string]: Type; }
{ [key: number]: Type; }
{ [key: symbol]: Type; }
{ [key: `data-${string}`]: Type; }

/*
Индексные типы позволяют определить тип данных для ключей объекта, которые могут быть строками, числами, символами 
или определенным шаблоном строк.

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Basic tuples	
let myTuple: [ string, number, boolean? ];
myTuple = [ 'test', 42 ];

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let a;
let b = 1;
 
// assign a value only if current value is truthy
 
a &&= 'default'; // a is still undefined
b &&=  5; // b is now 5

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let a;
let b = 0;
 
// assign a value only if current value is null or undefined
 
a ??= 'default'; // a is now 'default'
b ??=  5; // b is still 0

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// Overloads	
function conv(a: string): number;
function conv(a: number): string;
function conv(a: string | number): string | number {
   // ...
}

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https://stackoverflow.com/questions/5651654/ffmpeg-how-to-split-video-efficiently - VIDEO SPLIT

time ffmpeg -v quiet -y -i input.ts -vcodec copy -acodec copy -ss 00:00:00 -t 00:30:00 -sn test1.mkv
time ffmpeg -v quiet -y -i input.ts -vcodec copy -acodec copy -ss 00:30:00 -t 01:00:00 -sn test2.mkv

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Conditionally adding entries inside Array and object literals
http://2ality.com/2017/04/conditional-literal-entries.html

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padding: min(85%, 9.75em) 0;