fix: Return page width and height from document #618

Job	Run time
PHPUnit (PHP 7.2)	48s
Tests alternative autoloader (PHP 7.1)	9s
PHPUnit (PHP 7.3)	28s
Tests alternative autoloader (PHP 7.2)	16s
PHPUnit (PHP 7.4)	32s
Tests alternative autoloader (PHP 7.3)	43s
PHPUnit (PHP 8.0)	29s
Tests alternative autoloader (PHP 7.4)	8s
PHPUnit (PHP 8.1)	46s
Tests alternative autoloader (PHP 8.0)	10s
PHPUnit (PHP 8.2)	28s
Tests alternative autoloader (PHP 8.1)	10s
PHPUnit (PHP 8.3)	27s
Tests alternative autoloader (PHP 8.2)	7s
Tests alternative autoloader (PHP 8.3)	7s
PHPUnit Composer v2 (PHP 7.4)	28s
PHPUnit (PHP 7.1)	36s
PHPUnit coverage (PHP 7.4)	1m 8s
PHPUnit lowest deps (PHP 7.3)	26s
Windows-Tests with PHP 7.1	1m 8s
Windows-Tests with PHP 7.2	58s
Windows-Tests with PHP 7.3	55s
Windows-Tests with PHP 7.4	54s
Windows-Tests with PHP 8.0	57s
Windows-Tests with PHP 8.1	57s
Windows-Tests with PHP 8.2	1m 2s
Windows-Tests with PHP 8.3	48s
	16m 5s

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