HTML5和 frameorders

我有一个关于 HTML5文档的 iframe。当我验证时，我得到一个错误，告诉我 iframe frameBorder上的属性是过时的，并使用 CSS 代替。

我有这个属性 frameBorder="0"在这里，因为它是唯一的方法，我可以找出如何摆脱边界在 IE，我尝试了在 CSS 的 border:none;没有运气。有没有合适的方法来解决这个问题？

谢谢。

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最佳答案

HTML 5 doesn't support attributes such as frameborder, scrolling, marginwidth, and marginheight (which were supported in HTML 4.01). Instead, the HTML 5 specification has introduced the seamless attribute. The seamless attribute allows the inline frame to appear as though it is being rendered as part of the containing document. For example, borders and scrollbars will not appear.

According to MDN

frameborder Obsolete since HTML5

The value 1 (the default) draws a border around this frame. The value 0 removes the border around this frame, but you should instead use the CSS property border to control borders.

Like the quote above says, you should remove the border with CSS;
either inline (style="border: none;") or in your stylesheet (iframe { border: none; }).

That being said, there doesn't seem to be a single iframe provider that doesn't use frameborder="0". Even YouTube still uses the attribute and doesn't even provide a style attribute to make iframes backwards compatible for when frameborder isn't supported anymore. It's safe to say that the attribute isn't going anywhere soon. This leaves you with 3 options:

  1. Keep using frameborder, just to be sure it works (for now)
  2. Use CSS, to do the "right" thing
  3. Use both. Although this doesn't resolve the incompatibility problem (just like option 1), it does and will work in every browser that has been and will be

As for the previous state of this decade-old answer:

The seamless attribute has been supported for such a short time (or not at all by some browsers), that MDN doesn't even list it as a deprecated feature. Don't use it and don't get confused by the comments below.

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As per the other posting here, the best solution is to use the CSS entry of 

style="border:0;"
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I found a nice work around that will allow it to work in IE7 here. It bypasses the validator for the frameBorder attribute but keeps css for future browsers as explained in the post.

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How about using the same for technique for "fooling" the validator with Javascript by sticking a target attribute in XHTML <a onclick="this.target='_blank'">?

  • onsomething = " this.frameborder = '0' "

<iframe onload = " this.frameborder='0' " src="menu.html" id="menu"> </iframe>

Or getElementsByTagName]("iframe")1 adding this attribute for all iframes on the page?

Haven't tested this because I've done something which means that nothing is working in IE less than 9! :) So while I'm sorting that out ... :)

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Since the frameborder attribute is only necessary for IE, there is another way to get around the validator. This is a lightweight way that doesn't require Javascript or any DOM manipulation.

<!--[if IE]>
<iframe src="source" frameborder="0">?</iframe>
<![endif]-->
<!--[if !IE]>-->
<iframe src="source" style="border:none">?</iframe>
<!-- <![endif]-->
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This works

iframe{
border-width: 0px;
}

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