asp.net - 样式规则中的选择器后缺少左大括号 '({)'

Question

在 ASP.NET 4.0 中编程，我想我会在我的一个客户站点上开始使用 CSS3。

我首先制作了一个效果很好的 fiddle 。 fiddle 中使用的样式是

.newmainblock{
    background:rgb(254,254,253) ; /* Old browsers */
    background: -moz-linear-gradient(top,  rgba(254,254,253,1) 0%, rgba(220,227,196,1) 42%, rgba(174,191,118,1) 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(254,254,253,1)), color-stop(42%,rgba(220,227,196,1)), color-stop(100%,rgba(174,191,118,1))); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top,  rgba(254,254,253,1) 0%,rgba(220,227,196,1) 42%,rgba(174,191,118,1) 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top,  rgba(254,254,253,1) 0%,rgba(220,227,196,1) 42%,rgba(174,191,118,1) 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top,  rgba(254,254,253,1) 0%,rgba(220,227,196,1) 42%,rgba(174,191,118,1) 100%); /* IE10+ */
    background: linear-gradient(to bottom,  rgba(254,254,253,1) 0%,rgba(220,227,196,1) 42%,rgba(174,191,118,1) 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#fefefd', endColorstr='#aebf76',GradientType=0 ); /* IE6-9 */

    border: 1px solid #000000;
    height: 440px;
}​


#newbuttonbar {     
    background: rgb(180,221,180); /* Old browsers */
    /* IE9 SVG, needs conditional override of 'filter' to 'none' */
    background: url(data:image/svg+xml;base64,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);
    background: -moz-linear-gradient(top,  rgba(180,221,180,1) 0%, rgba(131,199,131,1) 17%, rgba(82,177,82,1) 33%, rgba(0,138,0,1) 67%, rgba(0,87,0,1) 83%, rgba(0,36,0,1) 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(180,221,180,1)), color-stop(17%,rgba(131,199,131,1)), color-stop(33%,rgba(82,177,82,1)), color-stop(67%,rgba(0,138,0,1)), color-stop(83%,rgba(0,87,0,1)), color-stop(100%,rgba(0,36,0,1))); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top,  rgba(180,221,180,1) 0%,rgba(131,199,131,1) 17%,rgba(82,177,82,1) 33%,rgba(0,138,0,1) 67%,rgba(0,87,0,1) 83%,rgba(0,36,0,1) 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top,  rgba(180,221,180,1) 0%,rgba(131,199,131,1) 17%,rgba(82,177,82,1) 33%,rgba(0,138,0,1) 67%,rgba(0,87,0,1) 83%,rgba(0,36,0,1) 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top, rgba(180,221,180,1) 0%,rgba(131,199,131,1) 17%,rgba(82,177,82,1) 33%,rgba(0,138,0,1) 67%,rgba(0,87,0,1) 83%,rgba(0,36,0,1) 100%); /* IE10+ */
    background: linear-gradient(to bottom, rgba(180,221,180,1) 0%,rgba(131,199,131,1) 17%,rgba(82,177,82,1) 33%,rgba(0,138,0,1) 67%,rgba(0,87,0,1) 83%,rgba(0,36,0,1) 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#b4ddb4', endColorstr='#002400',GradientType=0 ); /* IE6-8 */    
}​

(Demo here)

现在我将其复制到我的 Visual Studio 中的 css 并运行它。令我沮丧的是，我发现我根本看不到 newbuttonbar。我问过 Firebug ，他们告诉我根本没有定义 newbuttonbar。

此外，即使未应用样式，它仍会显示在 Firebug CSS 控制台中

终于找到原因了。 ( 我不确定这是否正确 )
CSS 编辑器提示 newmainblock 是

missing an opening brace '({)' after the selector in the style rule

因此它省略了 newmainblock 之后的标签。那就是 newbuttonbar。所有其他样式都被考虑在内。为什么会发生这种情况，我做错了什么以及如何纠正？

在我的 ASP.NET 生成页面的一个不相关的旁注 DTD 以及我的 fiddle 是 XHTMl1.0

Answer 1

您的 CSS 中右花括号后有一些无效字符。您的代码编辑器只是没有显示它们。在 Chrome 中尝试该页面，然后打开网络检查器 (F12)。切换到“资源”或“来源”选项卡并查看您的 CSS。你会明白我的意思。

这是固定的 CSS:

.newmainblock{
    background:rgb(254,254,253) ; /* Old browsers */
    background: -moz-linear-gradient(top,  rgba(254,254,253,1) 0%, rgba(220,227,196,1) 42%, rgba(174,191,118,1) 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(254,254,253,1)), color-stop(42%,rgba(220,227,196,1)), color-stop(100%,rgba(174,191,118,1))); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top,  rgba(254,254,253,1) 0%,rgba(220,227,196,1) 42%,rgba(174,191,118,1) 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top,  rgba(254,254,253,1) 0%,rgba(220,227,196,1) 42%,rgba(174,191,118,1) 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top,  rgba(254,254,253,1) 0%,rgba(220,227,196,1) 42%,rgba(174,191,118,1) 100%); /* IE10+ */
    background: linear-gradient(to bottom,  rgba(254,254,253,1) 0%,rgba(220,227,196,1) 42%,rgba(174,191,118,1) 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#fefefd', endColorstr='#aebf76',GradientType=0 ); /* IE6-9 */

    border: 1px solid #000000;
    height: 440px;
}
#newbuttonbar {     
    background: rgb(180,221,180); /* Old browsers */
    /* IE9 SVG, needs conditional override of 'filter' to 'none' */
    background: url(data:image/svg+xml;base64,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);
    background: -moz-linear-gradient(top,  rgba(180,221,180,1) 0%, rgba(131,199,131,1) 17%, rgba(82,177,82,1) 33%, rgba(0,138,0,1) 67%, rgba(0,87,0,1) 83%, rgba(0,36,0,1) 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(180,221,180,1)), color-stop(17%,rgba(131,199,131,1)), color-stop(33%,rgba(82,177,82,1)), color-stop(67%,rgba(0,138,0,1)), color-stop(83%,rgba(0,87,0,1)), color-stop(100%,rgba(0,36,0,1))); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top,  rgba(180,221,180,1) 0%,rgba(131,199,131,1) 17%,rgba(82,177,82,1) 33%,rgba(0,138,0,1) 67%,rgba(0,87,0,1) 83%,rgba(0,36,0,1) 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top,  rgba(180,221,180,1) 0%,rgba(131,199,131,1) 17%,rgba(82,177,82,1) 33%,rgba(0,138,0,1) 67%,rgba(0,87,0,1) 83%,rgba(0,36,0,1) 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top, rgba(180,221,180,1) 0%,rgba(131,199,131,1) 17%,rgba(82,177,82,1) 33%,rgba(0,138,0,1) 67%,rgba(0,87,0,1) 83%,rgba(0,36,0,1) 100%); /* IE10+ */
    background: linear-gradient(to bottom, rgba(180,221,180,1) 0%,rgba(131,199,131,1) 17%,rgba(82,177,82,1) 33%,rgba(0,138,0,1) 67%,rgba(0,87,0,1) 83%,rgba(0,36,0,1) 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#b4ddb4', endColorstr='#002400',GradientType=0 ); /* IE6-8 */    
}