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About HTML5 and CSS replacement use

迷茫

Jan 17, 2017 am 09:38 AM

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Everyone who has heard of HTML5 knows its power, such as more descriptive markup, multimedia support that is less dependent on plug-ins, cross-document message communication, Web Sockets, client-side storage, more powerful forms, and improved accessibility. flexibility, advanced selectors, and powerful visual effects. Without further ado, let’s go into details

Abandoned tags and attributes

Abandoned tags

Abandoned because they can be replaced with CSS

basefont

big

center

font

strike

Deprecated due to breaking usability and accessibility

frame

frameset

noframes

Causing confusion, infrequent

acronym is used and abandoned because it often clutters the page. You can use abbr instead.

applet is abandoned because you can use object instead.

isindex is abandoned. Because using form controls instead of

dir is deprecated because using ul instead of

noscript elements can only be used in HTML, not XML.

Obsolete attributes

align

link, vlink, alink and text attributes on the body tag

bgcolor

height and width

scrolling attributes on iframe elements

valign

hspace and vspace

cellpadding, cellspacing and border attributes on table tags

The visual effects achieved by the above elements can be achieved with css, so they are abandoned

In addition, the target attribute is abandoned in the specification

The profile attribute on the head tag will no longer be supported

The longdesc attribute of img and iframe elements has also been removed

There are alternatives to these attributes in the HTML5 specification, you can view HTML Standard

New structural tags and attributes

Document type declaration

<!doctype html><html>
  <head>
    <meta charset="UTF-8">
    <title>文章标题</title>
  </head>
  <body>

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