diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 98158df..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,9 +0,0 @@
-language: php
-php:
-  - 7.1
-  - 7.2
-  - 7.3
-  - 7.4
-install:
-  - composer install
-script: composer test
\ No newline at end of file
diff --git a/src/Containers/DocumentTags/BodyTag.php b/src/Containers/DocumentTags/BodyTag.php
index 19964b9..2612ef0 100644
--- a/src/Containers/DocumentTags/BodyTag.php
+++ b/src/Containers/DocumentTags/BodyTag.php
@@ -6,8 +6,5 @@ use ByJoby\HTML\Tags\AbstractContainerTag;
 
 class BodyTag extends AbstractContainerTag implements BodyTagInterface
 {
-    public function tag(): string
-    {
-        return 'body';
-    }
+    const TAG = 'body';
 }
diff --git a/src/Containers/DocumentTags/HeadTag.php b/src/Containers/DocumentTags/HeadTag.php
index d626e94..2bf12f3 100644
--- a/src/Containers/DocumentTags/HeadTag.php
+++ b/src/Containers/DocumentTags/HeadTag.php
@@ -6,6 +6,8 @@ use ByJoby\HTML\Tags\AbstractContainerTag;
 
 class HeadTag extends AbstractContainerTag implements HeadTagInterface
 {
+    const TAG = 'head';
+
     /** @var TitleTagInterface */
     protected $title;
 
@@ -20,9 +22,4 @@ class HeadTag extends AbstractContainerTag implements HeadTagInterface
     {
         return $this->title;
     }
-
-    public function tag(): string
-    {
-        return 'head';
-    }
 }
diff --git a/src/Containers/DocumentTags/HtmlTag.php b/src/Containers/DocumentTags/HtmlTag.php
index 36e58d0..712e70a 100644
--- a/src/Containers/DocumentTags/HtmlTag.php
+++ b/src/Containers/DocumentTags/HtmlTag.php
@@ -6,6 +6,8 @@ use ByJoby\HTML\Tags\AbstractContainerTag;
 
 class HtmlTag extends AbstractContainerTag implements HtmlTagInterface
 {
+    const TAG = 'html';
+
     /** @var HeadTagInterface */
     protected $head;
     /** @var BodyTagInterface */
@@ -26,11 +28,6 @@ class HtmlTag extends AbstractContainerTag implements HtmlTagInterface
         ];
     }
 
-    public function tag(): string
-    {
-        return 'html';
-    }
-
     public function head(): HeadTagInterface
     {
         return $this->head;
diff --git a/src/Containers/DocumentTags/TitleTag.php b/src/Containers/DocumentTags/TitleTag.php
index 5e408a2..57efdb0 100644
--- a/src/Containers/DocumentTags/TitleTag.php
+++ b/src/Containers/DocumentTags/TitleTag.php
@@ -2,12 +2,13 @@
 
 namespace ByJoby\HTML\Containers\DocumentTags;
 
-use ByJoby\HTML\Tags\AbstractContainerTag;
 use ByJoby\HTML\Traits\NodeTrait;
 use Exception;
 
 class TitleTag implements TitleTagInterface
 {
+    const TAG = 'title';
+
     use NodeTrait;
 
     /** @var string */
diff --git a/src/Helpers/Attributes.php b/src/Helpers/Attributes.php
index 3b36d06..07d76bb 100644
--- a/src/Helpers/Attributes.php
+++ b/src/Helpers/Attributes.php
@@ -47,7 +47,7 @@ class Attributes implements IteratorAggregate, ArrayAccess
     function offsetGet(mixed $offset): mixed
     {
         $offset = static::sanitizeOffset($offset);
-        return $this->array[$offset];
+        return @$this->array[$offset];
     }
 
     function offsetSet(mixed $offset, mixed $value): void
diff --git a/src/Html5/Html5Document.php b/src/Html5/Html5Document.php
new file mode 100644
index 0000000..e208b49
--- /dev/null
+++ b/src/Html5/Html5Document.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace ByJoby\HTML\Html5;
+
+use ByJoby\HTML\Containers\GenericHtmlDocument;
+
+class Html5Document extends GenericHtmlDocument
+{
+}
diff --git a/src/Html5/Tags/BaseTag.php b/src/Html5/Tags/BaseTag.php
new file mode 100644
index 0000000..fe75289
--- /dev/null
+++ b/src/Html5/Tags/BaseTag.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace ByJoby\HTML\Html5\Tags;
+
+use ByJoby\HTML\Tags\AbstractTag;
+
+class BaseTag extends AbstractTag
+{
+    const TAG = 'base';
+
+    public function href(): null|string
+    {
+        return $this->attributes()['href'];
+    }
+
+    public function setHref(null|string $href): static
+    {
+        $this->attributes()['href'] = $href;
+        return $this;
+    }
+
+    public function unsetHref(): static
+    {
+        unset($this->attributes()['href']);
+        return $this;
+    }
+
+    public function target(): null|string
+    {
+        return $this->attributes()['target'];
+    }
+
+    public function setTarget(null|string $target): static
+    {
+        $this->attributes()['target'] = $target;
+        return $this;
+    }
+
+    public function unsetTarget(): static
+    {
+        unset($this->attributes()['target']);
+        return $this;
+    }
+}
diff --git a/src/Html5/Tags/LinkTag.php b/src/Html5/Tags/LinkTag.php
new file mode 100644
index 0000000..8107a69
--- /dev/null
+++ b/src/Html5/Tags/LinkTag.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace ByJoby\HTML\Html5\Tags;
+
+use ByJoby\HTML\Tags\AbstractTag;
+
+class LinkTag extends AbstractTag
+{
+    const TAG = 'link';
+}
diff --git a/src/Html5/Tags/MetaTag.php b/src/Html5/Tags/MetaTag.php
new file mode 100644
index 0000000..6378a19
--- /dev/null
+++ b/src/Html5/Tags/MetaTag.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace ByJoby\HTML\Html5\Tags;
+
+use ByJoby\HTML\Tags\AbstractTag;
+
+class MetaTag extends AbstractTag
+{
+    const TAG = 'meta';
+}
diff --git a/src/Html5/Tags/StyleTag.php b/src/Html5/Tags/StyleTag.php
new file mode 100644
index 0000000..285a521
--- /dev/null
+++ b/src/Html5/Tags/StyleTag.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace ByJoby\HTML\Html5\Tags;
+
+use ByJoby\HTML\Tags\AbstractTag;
+
+// TODO: implement some sort of AbstractContentTag to hold non-HTML content like styles (maybe also make the TitleTag use this)
+class StyleTag extends AbstractTag
+{
+    const TAG = 'style';
+}
diff --git a/src/Tags/AbstractContainerTag.php b/src/Tags/AbstractContainerTag.php
index 613d9ba..f3a5ab2 100644
--- a/src/Tags/AbstractContainerTag.php
+++ b/src/Tags/AbstractContainerTag.php
@@ -2,8 +2,6 @@
 
 namespace ByJoby\HTML\Tags;
 
-use ByJoby\HTML\Helpers\Attributes;
-use ByJoby\HTML\Helpers\Classes;
 use ByJoby\HTML\Traits\ContainerMutableTrait;
 use ByJoby\HTML\Traits\ContainerTagTrait;
 use ByJoby\HTML\Traits\ContainerTrait;
@@ -17,4 +15,9 @@ abstract class AbstractContainerTag implements ContainerTagInterface
     use ContainerTagTrait {
         ContainerTagTrait::__toString insteadof TagTrait;
     }
+
+    public function tag(): string
+    {
+        return static::TAG; //@phpstan-ignore-line
+    }
 }
diff --git a/src/Tags/AbstractTag.php b/src/Tags/AbstractTag.php
index 1e9a20b..8ae7706 100644
--- a/src/Tags/AbstractTag.php
+++ b/src/Tags/AbstractTag.php
@@ -2,12 +2,15 @@
 
 namespace ByJoby\HTML\Tags;
 
-use ByJoby\HTML\Helpers\Attributes;
-use ByJoby\HTML\Helpers\Classes;
 use ByJoby\HTML\Traits\TagTrait;
 use ByJoby\HTML\Traits\NodeTrait;
 
 abstract class AbstractTag implements TagInterface
 {
     use NodeTrait, TagTrait;
+
+    public function tag(): string
+    {
+        return static::TAG; //@phpstan-ignore-line
+    }
 }
diff --git a/tests/Containers/FragmentTest.php b/tests/Containers/FragmentTest.php
index e9def6e..793a281 100644
--- a/tests/Containers/FragmentTest.php
+++ b/tests/Containers/FragmentTest.php
@@ -8,6 +8,13 @@ use PHPUnit\Framework\TestCase;
 
 class FragmentTest extends TestCase
 {
+    public function tag(string $name): AbstractContainerTag
+    {
+        $tag = $this->getMockForAbstractClass(AbstractContainerTag::class, [], '', true, true, true, ['tag']);
+        $tag->method('tag')->willReturn($name);
+        return $tag;
+    }
+
     public function testConstruction()
     {
         $empty = new Fragment();
@@ -19,10 +26,8 @@ class FragmentTest extends TestCase
     public function testNestingDocument(): Fragment
     {
         $fragment = new Fragment();
-        $div1 = $this->getMockForAbstractClass(AbstractContainerTag::class);
-        $div1->method('tag')->will($this->returnValue('div'));
-        $div2 = $this->getMockForAbstractClass(AbstractContainerTag::class);
-        $div2->method('tag')->will($this->returnValue('div'));
+        $div1 = $this->tag('div');
+        $div2 = $this->tag('div');
         // adding div1 to fragment sets its fragment
         $fragment->addChild($div1);
         $this->assertEquals($fragment, $div1->document());
@@ -40,8 +45,7 @@ class FragmentTest extends TestCase
         /** @var AbstractContainerTag */
         $div2 = $div1->children()[0];
         // add a span and verify it has the right parent
-        $span = $this->getMockForAbstractClass(AbstractTag::class);
-        $span->method('tag')->will($this->returnValue('span'));
+        $span = $this->tag('span');
         $div2->addChild($span);
         $this->assertEquals($fragment, $span->document());
         // detach and check document/parent of all nodes
diff --git a/tests/Html5/Tags/BaseTagTest.php b/tests/Html5/Tags/BaseTagTest.php
new file mode 100644
index 0000000..c4e12d0
--- /dev/null
+++ b/tests/Html5/Tags/BaseTagTest.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace ByJoby\HTML\Html5\Tags;
+
+class BaseTagTest extends TagTestCase
+{
+    public function testAttributeHelpers(): void
+    {
+        $this->assertAttributeHelperMethods('href', BaseTag::class);
+        $this->assertAttributeHelperMethods('target', BaseTag::class);
+    }
+}
diff --git a/tests/Html5/Tags/TagTestCase.php b/tests/Html5/Tags/TagTestCase.php
new file mode 100644
index 0000000..0a4424c
--- /dev/null
+++ b/tests/Html5/Tags/TagTestCase.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace ByJoby\HTML\Html5\Tags;
+
+use ByJoby\HTML\ContainerInterface;
+use ByJoby\HTML\Tags\TagInterface;
+use PHPUnit\Framework\TestCase;
+
+abstract class TagTestCase extends TestCase
+{
+    protected function assertAttributeHelperMethods(string $attribute, string $class, string $test_value = 'some-value', string $render_value = 'some-value'): void
+    {
+        /** @var TagInterface */
+        $tag = new $class;
+        $words = explode('-', $attribute);
+        $setFn = 'set' . implode('', array_map('ucfirst', $words));
+        $unsetFn = 'unset' . implode('', array_map('ucfirst', $words));
+        $getFn = array_shift($words) . implode('', array_map('ucfirst', $words));
+        // test setter and expected rendering
+        call_user_func([$tag, $setFn], $test_value);
+        $this->assertTagRendersAttribute($tag, $attribute, $render_value);
+        // test getter
+        $this->assertEquals($render_value, call_user_func([$tag, $getFn]));
+        $this->assertEquals($render_value, $tag->attributes()[$attribute]);
+        // test unsetting via unset
+        call_user_func([$tag,$unsetFn]);
+        $this->assertNull(call_user_func([$tag,$getFn]));
+    }
+
+    protected function assertTagRendersAttribute(TagInterface $tag, string $attribute, string $value)
+    {
+        if ($tag instanceof ContainerInterface) {
+            $this->assertEquals(
+                sprintf('<%s %s="%s"></%s>', $tag->tag(), $attribute, $value, $tag->tag()),
+                $tag->__toString(),
+                sprintf('Unexpected rendering of %s value %s is in %s tag', $attribute, $value, $tag->tag())
+            );
+        } else {
+            $this->assertEquals(
+                sprintf('<%s %s="%s"/>', $tag->tag(), $attribute, $value),
+                $tag->__toString(),
+                sprintf('Unexpected rendering of %s value %s is in %s tag', $attribute, $value, $tag->tag())
+            );
+        }
+    }
+}
diff --git a/tests/Tags/AbstractContainerTagTest.php b/tests/Tags/AbstractContainerTagTest.php
index d07bc84..f797b1c 100644
--- a/tests/Tags/AbstractContainerTagTest.php
+++ b/tests/Tags/AbstractContainerTagTest.php
@@ -2,21 +2,24 @@
 
 namespace ByJoby\HTML\Tags;
 
-use ByJoby\HTML\Helpers\Attributes;
-use ByJoby\HTML\Helpers\Classes;
 use ByJoby\HTML\Nodes\Text;
 use ByJoby\HTML\Nodes\UnsanitizedText;
 use PHPUnit\Framework\TestCase;
 
 class AbstractContainerTagTest extends TestCase
 {
+    public function tag(string $name): AbstractContainerTag
+    {
+        $tag = $this->getMockForAbstractClass(AbstractContainerTag::class, [], '', true, true, true, ['tag']);
+        $tag->method('tag')->willReturn($name);
+        return $tag;
+    }
+
     public function testDIV(): AbstractContainerTag
     {
-        $div = $this->getMockForAbstractClass(AbstractContainerTag::class);
-        $div->method('tag')->will($this->returnValue('div'));
+        $div = $this->tag('div');
         $this->assertEquals('<div></div>', $div->__toString());
-        $span = $this->getMockForAbstractClass(AbstractContainerTag::class);
-        $span->method('tag')->will($this->returnValue('span'));
+        $span = $this->tag('span');
         $div->addChild($span);
         $div->attributes()['a'] = 'b';
         $this->assertEquals(
@@ -34,9 +37,9 @@ class AbstractContainerTagTest extends TestCase
     /** @depends clone testDIV */
     public function testMoreNesting(AbstractContainerTag $div): AbstractContainerTag
     {
+        /** @var AbstractContainerTag */
         $span1 = $div->children()[0];
-        $span2 = $this->getMockForAbstractClass(AbstractContainerTag::class);
-        $span2->method('tag')->will($this->returnValue('span'));
+        $span2 = $this->tag('span');
         $span1->addChild($span2);
         $this->assertEquals(
             implode(PHP_EOL, [
@@ -54,8 +57,7 @@ class AbstractContainerTagTest extends TestCase
     /** @depends clone testDIV */
     public function testRemoveChild(AbstractContainerTag $div): void
     {
-        $span2 = $this->getMockForAbstractClass(AbstractContainerTag::class);
-        $span2->method('tag')->will($this->returnValue('span'));
+        $span2 = $this->tag('span');
         // add a second span and remove it using its object
         $div->addChild($span2);
         $this->assertCount(2, $div->children());
@@ -80,38 +82,36 @@ class AbstractContainerTagTest extends TestCase
     /** @depends clone testMoreNesting */
     public function testDetach(AbstractContainerTag $div): void
     {
-        $span1 = $div->children()[0];
-        $span2 = $span1->children()[0];
-        $span1->detach();
+        /** @var AbstractContainerTag */
+        $span = $div->children()[0];
+        $span->detach();
         $this->assertEquals('<div a="b"></div>', $div->__toString());
-        $this->assertNull($span1->parent());
+        $this->assertNull($span->parent());
     }
 
     /** @depends clone testMoreNesting */
     public function testDetachCopy(AbstractContainerTag $div): void
     {
-        $span1 = $div->children()[0];
-        $span2 = $span1->children()[0];
-        $copy = $span1->detachCopy();
+        /** @var AbstractContainerTag */
+        $span = $div->children()[0];
+        $copy = $span->detachCopy();
         $this->assertNull($copy->parent());
-        $this->assertEquals($div, $span1->parent());
+        $this->assertEquals($div, $span->parent());
     }
 
     public function testAddChildBefore(): void
     {
-        $div = $this->getMockForAbstractClass(AbstractContainerTag::class);
-        $div->method('tag')->will($this->returnValue('div'));
+        $div = $this->tag('div');
         // add a string child
         $div->addChild('a');
         $div->addChildBefore('b', 'a');
         $this->assertEquals('b', $div->children()[0]->__toString());
         // add an actual node object
-        $span1 = $this->getMockForAbstractClass(AbstractContainerTag::class);
-        $span1->method('tag')->will($this->returnValue('span'));
-        $div->addChildBefore($span1, 'a');
-        $this->assertEquals($span1, $div->children()[1]->__toString());
+        $span = $this->tag('span');
+        $div->addChildBefore($span, 'a');
+        $this->assertEquals($span, $div->children()[1]->__toString());
         // add another object referencing the node object
-        $div->addChildBefore('c', $span1);
+        $div->addChildBefore('c', $span);
         $this->assertEquals('c', $div->children()[1]->__toString());
         // should throw an exception if reference child is not found
         $this->expectExceptionMessage('Reference child not found in this container');
@@ -120,19 +120,17 @@ class AbstractContainerTagTest extends TestCase
 
     public function testAddChildAfter(): void
     {
-        $div = $this->getMockForAbstractClass(AbstractContainerTag::class);
-        $div->method('tag')->will($this->returnValue('div'));
+        $div = $this->tag('div');
         // add a string child
         $div->addChild('a');
         $div->addChildAfter('b', 'a');
         $this->assertEquals('b', $div->children()[1]->__toString());
         // add an actual node object
-        $span1 = $this->getMockForAbstractClass(AbstractContainerTag::class);
-        $span1->method('tag')->will($this->returnValue('span'));
-        $div->addChildAfter($span1, 'a');
-        $this->assertEquals($span1, $div->children()[1]->__toString());
+        $span = $this->tag('span');
+        $div->addChildAfter($span, 'a');
+        $this->assertEquals($span, $div->children()[1]->__toString());
         // add another object referencing the node object
-        $div->addChildAfter('c', $span1);
+        $div->addChildAfter('c', $span);
         $this->assertEquals('c', $div->children()[2]->__toString());
         // should throw an exception if reference child is not found
         $this->expectExceptionMessage('Reference child not found in this container');
diff --git a/tests/Tags/AbstractTagTest.php b/tests/Tags/AbstractTagTest.php
index 5639161..b6b1920 100644
--- a/tests/Tags/AbstractTagTest.php
+++ b/tests/Tags/AbstractTagTest.php
@@ -8,10 +8,17 @@ use PHPUnit\Framework\TestCase;
 
 class AbstractTagTest extends TestCase
 {
+
+    public function tag(string $name): AbstractTag
+    {
+        $tag = $this->getMockForAbstractClass(AbstractTag::class, [], '', true, true, true, ['tag']);
+        $tag->method('tag')->willReturn($name);
+        return $tag;
+    }
+
     public function testBR(): AbstractTag
     {
-        $br = $this->getMockForAbstractClass(AbstractTag::class);
-        $br->method('tag')->will($this->returnValue('br'));
+        $br = $this->tag('br');
         $this->assertEquals('<br/>', $br->__toString());
         $this->assertInstanceOf(Classes::class, $br->classes());
         $this->assertInstanceOf(Attributes::class, $br->attributes());