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<h1>Εμφάνιση links σε ένα οριζόντιο μενού:</h1>

  <li><a href="http://infolesson.com" target="_blank">ΔΩΡΕΑΝ ΜΑΘΗΜΑΤΑ ΠΛΗΡΟΦΟΡΙΚΗΣ</a></li>
  <li><a href="http://5gym-xanth.xan.sch.gr/" target="_blank">5ο ΓΥΜΝΑΣΙΟ ΞΑΝΘΗΣ</a></li>
  <li><a href="https://twitter.com/5gym" target="_blank">5ο ΓΥΜΝΑΣΙΟ ΞΑΝΘΗΣ Twitter </a></li>
  <h1>Παράδειγμα block</h1>
  <span>Η ιδιότητα display είναι η πιο σημαντική ιδιότητα </span> <span> για τον έλεγχο της διάταξης μιας ιστοσελίδας,καθορίζει αν / πώς εμφανίζεται ένα στοιχείo.</span>
  <h2 class="hidden">Δεν εμφανίζομαι!!</h2>
              li {
    display: inline;
span {
    display: block;
h2.hidden {
    display: none;

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