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<a href="http://wp.pl" class="foo bar"
   id="glink" data-foo="1">
    <h1>WP.PL</h1>
</a>

link.classList;//pobieramy
link.className;//pobieramy
link.id;//pobieramy
link.innerHTML;//pobieramy
link.id = 'newId';
link.className = 'newClass1 newClass2';
link.outerHTML;
link.innerText;
link.tagName;
link.dataset;
 
element.style.backgroundColor;
element.style.backgroundColor = "blue"
element.style.fontSize;
element.style.padding;

el.classList.add(className)
el.classList.remove(className)
el.classList.toggle(className)



<div id="user" data-id="1234567890"
     data-user="johndoe"
     data-date-of-birth>John Doe
</div>

console.log(myUser.dataset);
console.log(myUser.dataset.id);
console.log(myUser.dataset.user);
console.log(myUser.dataset.dateOfBirth;


link.hasAttribute("href");
link.getAttribute('href');
link.removeAttribute("href");
link.setAttribute("href", "www.wp.pl");