blocks|key|1453469|text|对于要覆盖另一图像的背景图像，必须是覆盖所述图像的元素上的背景(例如绝对定位的背景)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1453470|元素本身的背景不能出现在其内容之上。|1453471|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

For a background image to cover another image, it must be a background on an element that covers said image (e.g. one that is absolutely positioned).

An element's own background cannot appear above its content.

blocks|key|2595641|text|不，<img+src=''>中定义的图像是元素的前台内容。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|BOLD|entityRanges|data|2595642|background-image是元素的背景。它显示在任何内容的背后。|2595643|线索就在名字里。|2595644|要使背景图像出现在前台内容的顶部，唯一的方法是使其成为位于主元素顶部的单独元素的背景。|2595645|您可以通过使用CSS+::before伪选择器来实现这一点，而无需额外的HTML标记。这将向DOM中主元素旁边的页面添加一个CSS控制的元素。然后可以使用z-index和定位对其进行样式化，这样就可以将其放在主元素的顶部。然后它的background-image将出现在原始元素的主图像的顶部。|2595646|但是，并非所有浏览器的::before标记都支持img，因此不推荐这种技术。|2595647|entityMap^0|2|C|O|4|0|0|G|K|2|0|0|0|B|8|25|7|37|G|0|B|8|O|3|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|D]]|E|@]|F|$]]|$1|I|3|J|5|6|7|12|8|@]|E|@]|F|$]]|$1|K|3|L|5|6|7|13|8|@]|E|@]|F|$]]|$1|M|3|N|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|E|@]|F|$]]|$1|O|3|P|5|6|7|1B|8|@$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]]|E|@]|F|$]]|$1|Q|3|-4|5|6|7|1G|8|@]|E|@]|F|$]]]|R|$]]

No, the image defined in the <code>&lt;img src=''&gt;</code> is the foreground content of the element.

The <code>background-image</code> is the background of the element. It is shown behind any content.

The clue is in the name.

The only way you can get a background image to appear on top of the foreground content is for it to be the background of a separate element that is positioned on top of the main element.

You can do this without additional HTML markup by making use of the CSS <code>::before</code> pseudo-selector. This adds a CSS-controlled element to the page next to your main element in the DOM. This can then be styled with <code>z-index</code> and positioning, so that is is on top of the main element. Then its <code>background-image</code> will appear on top of the main image from the original element.

However, <code>::before</code> is not supported on <code>img</code> tags in all browsers, so this technique is not recommended.

blocks|key|2595675|text|对背景图像这样做是不好的做法，最终您将得到大量的脏代码。我认为这是不必要的，因为你把一个图像作为背景，你希望它成为z-索引的第一层(这是background-image:url('./images/image-mask-2.png');背后的整个概念)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2595676|entityMap^0|1W|1E|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Its bad practice to do that for background images, you will end up with alot of dirty code. And I thing its unnecessary, cause the reason you put an image as a background you want it to be the first layer on the z-index (that is the whole concept behind <code>background-image:url('./images/image-mask-2.png');</code>)

blocks|key|2595690|text|用div把背景放到另一个背景上？给身体一个背景和你的div？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2595691|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Just use a div to place a background on another background? Give the body a background and your div?

blocks|key|1453556|text|首先，我创建了一个315+To+*270+To的自定义映像大小。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1453557|add_action(+'after_setup_theme',+'image-size-setup'+);
add_image_size(+'image-with-mask',+315,+270,+true+);

function+image-size-setup()+{

function+custom_in_post_images(+$args+)+{+$custom_images+=+array('image-with-mask'+=>+'Image+with+mask');+return+array_merge(+$args,+$custom_images+);+}+add_filter(+'image_size_names_choose',+'custom_in_post_images'+);

}|code-block|syntax|javascript|1453558|最后，我使用add_filter函数(在wordpress中)将宽度为315+to、高度为270+to的标记替换为2个div(一个用于掩码，另一个用于图片)。|1453559|function+some_filter_content($content)+{
++++$result+=+array();

++++return+preg_replace('/<img.class="(.*?)".src="(.*?)".width="315".height="270".\/>/i',+'<div+style="background:+url($2);+width:315px;+height:270px;+float:left;"><div+class="mask"></div></div>',+$content);

}
++++add_filter('the_content',+'some_filter_content');|1453560|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

To start with, I created a custom image size of 315px * 270px

<pre><code>add_action( 'after_setup_theme', 'image-size-setup' );
add_image_size( 'image-with-mask', 315, 270, true );

function image-size-setup() {

function custom_in_post_images( $args ) { $custom_images = array('image-with-mask' =&gt; 'Image with mask'); return array_merge( $args, $custom_images ); } add_filter( 'image_size_names_choose', 'custom_in_post_images' );

}
</code></pre>

I ended up using add_filter function (in wordpress) to replace tags which had width of 315px and height of 270px with 2 div's (one for the mask and one for the picture)

<pre><code>function some_filter_content($content) {
 $result = array();

 return preg_replace('/&lt;img.class="(.*?)".src="(.*?)".width="315".height="270".\/&gt;/i', '&lt;div style="background: url($2); width:315px; height:270px; float:left;"&gt;&lt;div class="mask"&gt;&lt;/div&gt;&lt;/div&gt;', $content);

}
 add_filter('the_content', 'some_filter_content');
</code></pre>

blocks|key|1453589|text|试着用填充物代替宽度和高度|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1453590|#content+img{
++++height:+0;
++++width:+0;
++++padding:+35px+120px;+//+adjust+that+depend+on+your+image+size
++++background-image:+url('YOUR_IMAGE_PATH');
++++background-repeat:+no-repeat;
}|code-block|syntax|javascript|1453591|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

try to use padding instead of using width and height

<pre><code>#content img{
 height: 0;
 width: 0;
 padding: 35px 120px; // adjust that depend on your image size
 background-image: url('YOUR_IMAGE_PATH');
 background-repeat: no-repeat;
}
</code></pre>

I was wondering whether it's possible to get background-image to be on top of all html img's in a certain div (like a sort of mask)

I tried:

<pre><code>#content img{
 position:relative;
 background-image:url('./images/image-mask-2.png');
 z-index:100;
}
</code></pre>

CSS Background-image over HTML img

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想知道是否有可能在特定的div中将背景图像放在html的所有img之上(就像一种掩码)。我试过：#content img{    position:relative;    background-image:url('./images/image-mask-2.png');    z-index:100;}

问CSS背景- HTML img上的图像
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