diff --git a/Mf2/Parser.php b/Mf2/Parser.php
index ed1f28f..317db25 100644
--- a/Mf2/Parser.php
+++ b/Mf2/Parser.php
@@ -588,13 +588,13 @@ public function parseP(\DOMElement $p) {
 
 		$this->resolveChildUrls($p);
 		
-		if ($p->tagName == 'img' and $p->getAttribute('alt') !== '') {
+		if ($p->tagName == 'img' and $p->hasAttribute('alt')) {
 			$pValue = $p->getAttribute('alt');
-		} elseif ($p->tagName == 'area' and $p->getAttribute('alt') !== '') {
+		} elseif ($p->tagName == 'area' and $p->hasAttribute('alt')) {
 			$pValue = $p->getAttribute('alt');
-		} elseif ($p->tagName == 'abbr' and $p->getAttribute('title') !== '') {
+		} elseif ($p->tagName == 'abbr' and $p->hasAttribute('title')) {
 			$pValue = $p->getAttribute('title');
-		} elseif (in_array($p->tagName, array('data', 'input')) and $p->getAttribute('value') !== '') {
+		} elseif (in_array($p->tagName, array('data', 'input')) and $p->hasAttribute('value')) {
 			$pValue = $p->getAttribute('value');
 		} else {
 			$pValue = unicodeTrim($this->innerText($p));
@@ -611,11 +611,11 @@ public function parseP(\DOMElement $p) {
 	 * @todo make this adhere to value-class
 	 */
 	public function parseU(\DOMElement $u) {
-		if (($u->tagName == 'a' or $u->tagName == 'area') and $u->getAttribute('href') !== null) {
+		if (($u->tagName == 'a' or $u->tagName == 'area') and $u->hasAttribute('href')) {
 			$uValue = $u->getAttribute('href');
-		} elseif (in_array($u->tagName, array('img', 'audio', 'video', 'source')) and $u->getAttribute('src') !== null) {
+		} elseif (in_array($u->tagName, array('img', 'audio', 'video', 'source')) and $u->hasAttribute('src')) {
 			$uValue = $u->getAttribute('src');
-		} elseif ($u->tagName == 'object' and $u->getAttribute('data') !== null) {
+		} elseif ($u->tagName == 'object' and $u->hasAttribute('data')) {
 			$uValue = $u->getAttribute('data');
 		}
 
@@ -627,9 +627,9 @@ public function parseU(\DOMElement $u) {
 
 		if ($classTitle !== null) {
 			return $classTitle;
-		} elseif ($u->tagName == 'abbr' and $u->getAttribute('title') !== null) {
+		} elseif ($u->tagName == 'abbr' and $u->hasAttribute('title')) {
 			return $u->getAttribute('title');
-		} elseif (in_array($u->tagName, array('data', 'input')) and $u->getAttribute('value') !== null) {
+		} elseif (in_array($u->tagName, array('data', 'input')) and $u->hasAttribute('value')) {
 			return $u->getAttribute('value');
 		} else {
 			return unicodeTrim($this->textContent($u));
@@ -1128,7 +1128,7 @@ public function parseImpliedPhoto(\DOMElement $e) {
 
 					if ($el->tagName == 'img') {
 						return $el->getAttribute('src');
-					} else if ($el->tagName == 'object' && $el->getAttribute('data') != '') {
+					} else if ($el->tagName == 'object' && $el->hasAttribute('data')) {
 						return $el->getAttribute('data');
 					}
 
diff --git a/tests/Mf2/ParsePTest.php b/tests/Mf2/ParsePTest.php
index 1e7d0af..55f4a98 100644
--- a/tests/Mf2/ParsePTest.php
+++ b/tests/Mf2/ParsePTest.php
@@ -67,6 +67,18 @@ public function testParsePHandlesData() {
 		$this->assertEquals('Example User', $output['items'][0]['properties']['name'][0]);
 	}
 
+	/**
+	 * @group parseP
+	 */
+	public function testParsePHandlesDataWithBlankValueAttribute() {
+		$input = '<div class="h-card"><data class="p-name" value="">Example User</data></div>';
+		$parser = new Parser($input);
+		$output = $parser->parse();
+
+		$this->assertArrayHasKey('name', $output['items'][0]['properties']);
+		$this->assertEquals('', $output['items'][0]['properties']['name'][0]);
+	}
+
 	/**
 	 * @group parseP
 	 */
diff --git a/tests/Mf2/ParseUTest.php b/tests/Mf2/ParseUTest.php
index 1f017d4..b10957b 100644
--- a/tests/Mf2/ParseUTest.php
+++ b/tests/Mf2/ParseUTest.php
@@ -25,7 +25,31 @@ public function testParseUHandlesA() {
 		$this->assertArrayHasKey('url', $output['items'][0]['properties']);
 		$this->assertEquals('http://example.com', $output['items'][0]['properties']['url'][0]);
 	}
-	
+
+	/**
+	 * @group parseU
+	 */
+	public function testParseUHandlesEmptyHrefAttribute() {
+		$input = '<div class="h-card"><a class="u-url" href="">Awesome example website</a></div>';
+		$parser = new Parser($input, "http://example.com/");
+		$output = $parser->parse();
+		
+		$this->assertArrayHasKey('url', $output['items'][0]['properties']);
+		$this->assertEquals('http://example.com/', $output['items'][0]['properties']['url'][0]);
+	}
+
+	/**
+	 * @group parseU
+	 */
+	public function testParseUHandlesMissingHrefAttribute() {
+		$input = '<div class="h-card"><a class="u-url">Awesome example website</a></div>';
+		$parser = new Parser($input, "http://example.com/");
+		$output = $parser->parse();
+		
+		$this->assertArrayHasKey('url', $output['items'][0]['properties']);
+		$this->assertEquals('Awesome example website', $output['items'][0]['properties']['url'][0]);
+	}
+
 	/**
 	 * @group parseU
 	 */
@@ -73,6 +97,18 @@ public function testParseUHandlesAbbr() {
 		$this->assertArrayHasKey('photo', $output['items'][0]['properties']);
 		$this->assertEquals('http://example.com/someimage.png', $output['items'][0]['properties']['photo'][0]);
 	}
+
+	/**
+	 * @group parseU
+	 */
+	public function testParseUHandlesAbbrNoTitle() {
+		$input = '<div class="h-card"><abbr class="u-photo">no title attribute</abbr></div>';
+		$parser = new Parser($input);
+		$output = $parser->parse();
+		
+		$this->assertArrayHasKey('photo', $output['items'][0]['properties']);
+		$this->assertEquals('no title attribute', $output['items'][0]['properties']['photo'][0]);
+	}
 	
 	/**
 	 * @group parseU
@@ -161,6 +197,17 @@ public function testParseUHandlesVideo() {
 		$this->assertEquals('http://example.com/video.mp4', $output['items'][0]['properties']['video'][0]);
 	}
 
+	/**
+	 * @group parseU
+	 */
+	public function testParseUHandlesVideoNoSrc() {
+		$input = '<div class="h-entry"><video class="u-video">no video support</video></div>';
+		$parser = new Parser($input);
+		$output = $parser->parse();
+
+		$this->assertArrayHasKey('video', $output['items'][0]['properties']);
+		$this->assertEquals('no video support', $output['items'][0]['properties']['video'][0]);
+	}
 
 	/**
 	 * @group parseU