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HTML4 vs HTML5:  What's the difference


In 1993, HTML (HyperText Markup Language) was first introduced as standard code for web pages on the Internet and has been developed a number of times.
In 1998 HTML version 4 (html4) was released which was easy to use for hobbyists and beginners to create web pages.
In 2014 HTML version 5 (html5) was released as standard with many more possibilities.. The biggest change is that content and layout are strongly separated from each other. A disadvantage of html5 is that a number of attributes of html4 are no longer supported and the use of css has become almost necessary. Why it was decided to no longer support a number of html4 attributes may have to do with de-cluttering. For those who are used to html4, this is a big adjustment.
Browsers know which versions of a web page the codes are because the top line of the page states which version is intended.
    for html5: <!DOCTYPE html>
    for html4: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
Hopefully, browsers will continue to support the web pages made in older html versions for a long time so that we can continue to view them.

Disappeared in html5:
• <font> . . . </font>   nu: <p style= ...> . . . </p>
    for example   <p style="color:blue"> . . . </p>
    this is also the case for    <p style="font-size:11px">  en  <p style="font-family:verdana">
• <center> . . . </center>  nu: <p span align="middle"> . . . </p>
• <a name="(named link destination"> . . . </a>   nu: <a id="(named link destination"> . . . </a>
• <table width="50%"> . . . </table>  nu: <table style="50%">
• <td width="50"> . . . </td>  nu: <td style="width: 50px;"> . . . </td>
• <BODY text="#000088" bgcolor="#9999ee" link="#000088">  now: can only be done with CSS

links html4:
manual in Dutch
HTML4 Element Reference, tags alphabet


links html5:
tutorial, manual attributes
HTML5 Element Reference, tags alphabet
HTML5 validator