bootstrap.php

<?php

// Include Composer Autoloader.
require_once __DIR__ . '/../vendor/autoload.php';

use ABGEO\HTMLGenerator\Document;
use ABGEO\HTMLGenerator\Element;
use ABGEO\HTMLGenerator\Exception\InvalidDocumentException;

$document = new Document();
$element = new Element();

try {
    $container = Element::createDiv(
        Element::createDiv(
            Element::createDiv(
                Element::concatenateElements(
                    Element::createHeading('Hello, World!', 1, ['mt-5']),
                    Element::createParagraph(
                        'This is simple Bootstrap 4 page', ['lead']
                    ),
                    Element::createList(
                        [
                            Element::concatenateElements(
                                'Generated By ',
                                Element::createLink(
                                    'gen-html',
                                    'https://github.com/ABGEO07/gen-html/commits/master',
                                    Element::TARGET_BLANK
                                ), '.'
                            )
                        ], Element::LIST_UNORDERED, ['list-unstyled']
                    )
                ),
                ['col-lg-12', 'text-center']
            ),
            ['row']
        ),
        ['container']
    );

    $document
        ->setTitle('Title')
        ->addStyle('https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css')
        ->setBody($container)
        ->addScript('https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js')
        ->addScript('https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js');

    echo $document->getDocument();
} catch (InvalidDocumentException $e) {
    die($e->getMessage());
} catch (ReflectionException $e) {
    die($e->getMessage());
}