README

This package adds support for subscript and superscript in Markdown (using <sub> and <sup> HTML tags). This package also duplicates the logic used in the League Strikethrough Extension (which generates <del> tags).

There is no official spec that supports both subscript and strikethrough. As they both typically use the tilde character (~), we follow the extended syntax of Markdown Guide. That means that strikethrough with only one tilde is necessarily NOT supported. Subscript and strikethrough can be nested, similar to how emphasis works (~Subscript ~~Subscript and striked~~~).

Added markdown features

Install

This project can be installed via composer:

composer require cradeq/commonmark-strikethrough-sub-sup-extension

Usage

use Cradeq\CommonMark\StrikethroughSubExtension;
use Cradeq\CommonMark\SupExtension;
use League\CommonMark\Environment\Environment;
use League\CommonMark\Extension\CommonMark\CommonMarkCoreExtension;

$environment = new Environment();
$environment->addExtension(new CommonMarkCoreExtension);
$environment->addExtension(new StrikethroughSubExtension);
$environment->addExtension(new SupExtension);