Hi 👋

We are using htmlpurifier for nextcloud/mail to sanitize the body of html messages and have a bug report that a mail is not rendered correctly (nextcloud/mail#5279).

I debugged the mail body and found that

* img[tabindex="0"] + div { text-align:center }

is rewritten to

* + div { text-align:center }

A test case for ExtractStyleBlocksTest:

	public function test_cleanCSS_elementWithAttribute()
	{
		$this->assertCleanCSS(
			"* img[tabindex=\"0\"] + div {\ntext-align:center\n}",
			"* img + div {\ntext-align:center\n}"
		);
	}