CSS 2.1错误：不是已知的属性名称

Question

这是我的代码，我是从AJAX示例中得到的：

body, div, p, h1, h2, h3, h4, ul, li, table
{
    margin:0;
    padding:0;
    border:none;
}

body
{
    background: #B4B4B4 url(images/body_bg.gif) repeat left top;    
    font-family: Tahoma, Arial, sans-serif;
    font-size:75%;
}

/* Master Page Layout */
#master_header
{
    margin: -1px auto 0 auto;
    width: 800px;
}

#master_headertop
{
    background: url(images/headertop_img.jpg) no-repeat left top;
}

#master_headerbottom
{
    background: url(images/headerbottom_img.png) no-repeat left top;
}

#master_page
{
    margin: 5px auto 20px auto;
    width: 800px;
}

#master_menu 
{
    float: left;
    width: 240px;
    padding-right: 10px;
}

.sidebar 
{
    width: 100%;
    margin-bottom: 10px;
}

.sidebarheader
{
    height: 24px;
    padding: 10px 0 0 35px;
    background: url(images/sidebar_header.png) no-repeat left top;
    color: #FFF;
    font-family: Arial, Sans-Serif;
    font-size: 1.2em;
    font-weight: bold;
    text-transform: uppercase;
}

.sidebarcontent
{   
    border: 1px solid #0F2543;
    padding: 20px 20px 20px 30px;
    line-height: 1.5em;
    font-weight: bold;
}

#master_sidebarSamples
{   
    padding-top: 72px;
    background: #FFF url(images/samples_bg.gif) no-repeat left top;
}

#master_sidebarWalkthroughs
{
    padding-top: 72px;
    background: #FFF url(images/walkthrough_bg.gif) no-repeat left top;
}

.sidebarcontent a
{
    padding: 2px 5px;
    color: #5377A9;
    text-decoration: none;
}

.sidebarcontent a:hover
{
    background-color: #0F2543;
    color: #FFF;
}

.sidebarcontent a:visited
{
    font-weight: normal;
}

#master_content
{
    float: left;
    width: 550px;
    margin-right: -550px;
    color: #666666;
}

/*
#master_content a
{
    color: #5377A9;
    padding: 1px;
}

#master_content a:link
{
}

#master_content a:visited
{
}

#master_content a:hover
{
    background-color: #BFBFBF;
    color:#FFF;
}
*/

#master_content ul
{
    margin: 0 25px 0 30px;
}

#master_contentheader
{
    height: 19px;
    background: url(images/rightcoltop.gif) no-repeat right top;
}

#master_contentplaceholder
{
    padding: 30px 20px 40px 20px;
    border-left: 1px solid #0F2543;
    border-right: 1px solid #0F2543;
    border-bottom: 1px solid #0F2543;
    background-color: #EFEFEF;
    line-height: 1.5em;
}

#master_contentfooter
{
    clear: both;
    padding: 10px 0 5px 10px;
    color: #333;
    font-size: 0.8em;
    letter-spacing: 0.1em;
}

/* Content Page Layout             */
.demoarea {
    padding:20px;
    background:#FFF url(images/demotop.png) no-repeat left top;
}

.demoarea p 
{
    padding:5px;
}

.demoheading {
    padding-bottom:20px;
    color:#5377A9;
    font-family:Arial, Sans-Serif;
    font-weight:bold;
    font-size:1.5em;
}

.demobottom {
    height:8px;
    background:#FFF url(images/demobottom.png) no-repeat left bottom;
}


.heading {
    padding: 1em 0 1em 0;
    color:#5377A9;
    font-family:Arial, Sans-Serif;
    font-weight:bold;
    font-size:1.2em;
}

.subheading{
    padding:.8em 0 0.5em 0;
    color:#0F2543;
    font-weight:bold;
    font-family:Arial, Sans-Serif;
    font-size:1.1em;
}

p {}

em {font-style:italic}

i {font-style: italic;}

strong {font-weight:bold;}

.codeReference
{
    font-family: 'Courier New', Monospace;
    font-style: normal;
    font-weight: bold;
}

pre, code {
    display:block;
    margin:15px 15px 15px 0;
    padding:10px;
    border:1px dashed #CCC;
    background-color:#FFF;
    color:#000;
    font-family:'Courier New', Monospace;
    font-size:0.9em;
    font-style:normal;
}

.releaseList {
    list-style-type:disc;
}


/* Styles for the Animation Reference */
.animationReferenceTable
{
}

.animationReferenceRow
{
}

.animationReferenceField
{
    text-align: right;
    vertical-align: top;
    padding-top: 5px;
}

.animationReferenceCode
{
    margin-top: 5px;
    vertical-align: top;
    font-family: 'Courier New', Monospace;
    font-style: normal;
    font-weight: bold;

    display:block;
    background-color:#FFF;
    color:#000;
    font-family:'Courier New', Monospace;
    font-size:0.9em;
    font-style:normal;
    font-weight: bold;
    margin-bottom: 5px;
}

.animationReferenceItems
{
    vertical-align: top;
}

.animationReferenceItemTable
{
    width: 100%;
    padding: 0px;
    margin: 0px;
}

.animationReferenceItemRow
{
    width: 100%;
    padding: 0px;
    margin: 0px;
}

.animationReferenceItem
{
    width: 100%;
    padding: 0px;
    margin: 0px;
    padding-bottom: 10px;
}

.animationReferenceItemCode
{
    display:block;
    background-color:#FFF;
    color:#000;
    font-family:'Courier New', Monospace;
    font-size:0.9em;
    font-style:normal;
    font-weight: bold;
}

/******************************/
/**Styling information specific to individual content pages**/

/* Accordion */
.accordionHeader
{
    border: 1px solid #2F4F4F;
    color: white;
    background-color: #2E4d7B;
    font-family: Arial, Sans-Serif;
    font-size: 12px;
    font-weight: bold;
    padding: 5px;
    margin-top: 5px;
    cursor: pointer;
}

#master_content .accordionHeader a
{
    color: #FFFFFF;
    background: none;
    text-decoration: none;
}

#master_content .accordionHeader a:hover
{
    background: none;
    text-decoration: underline;
}

.accordionContent
{
    background-color: #D3DEEF;
    border: 1px dashed #2F4F4F;
    border-top: none;
    padding: 5px;
    padding-top: 10px;
}

/*Cascading DropDown*/

/*CollapsiblePanel*/
.collapsePanel {

    background-color:white;
    overflow:hidden;
}

.collapsePanelHeader{   
    width:100%;     
    height:30px;
    background-image: url(images/bg-menu-main.png);
    background-repeat:repeat-x;
    color:#FFF;
    font-weight:bold;
}

#master_content .collapsePanelHeader a {color:#FFF;}
#master_content .collapsePanelHeader a:hover {text-decoration:none;background:none;}

/*Confirm Button*/

/* DropShadow */

#master_content .dropShadowPanel span {color:white;text-decoration:underline;}
#master_content .dropShadowPanel span:hover {text-decoration:none;}


.dropShadowPanel 
{   
    width:300px;    
    background-color:#5377A9;       
    color:white;
    font-weight:bold;       
}

/*Drag Panel*/
.dragMe {
    width:100%;
    height:21px;
    background-color:#FFF;
    background-image:url(images/header-opened.png);
    text-align:center;
    cursor:move;
    font-weight:bold;
}

.overflowHidden {overflow:hidden;}

.overflowScroll {overflow:hidden;}

/*Hover Menu*/
.popupMenu {
    position:absolute;
    visibility:hidden;
    background-color:#F5F7F8;
    opacity:.9;
    filter: alpha(opacity=90);
}

.popupHover {
    background-image:url(images/header-opened.png);
    background-repeat:repeat-x;
    background-position:left top;
    background-color:#F5F7F8;
}

/* PagingBulletedList */
.selectIndex {
    font-weight: bold;
    text-decoration:none;
}
.unselectIndex {
    font-weight:normal;
    text-decoration:underline;
}


/*Modal Popup*/
.modalBackground {
    background-color:Gray;
    filter:alpha(opacity=70);
    opacity:0.7;
}

.modalPopup {
    background-color:#ffffdd;
    border-width:3px;
    border-style:solid;
    border-color:Gray;
    padding:3px;
    width:250px;
}

.sampleStyleA {
    background-color:#FFF;
}

.sampleStyleB {
    background-color:#FFF;
    font-family:monospace;
    font-size:10pt;
    font-weight:bold;
}

.sampleStyleC {
    background-color:#ddffdd;
    font-family:sans-serif;
    font-size:10pt;
    font-style:italic;
}

.sampleStyleD {
    background-color:Blue;
    color:White;
    font-family:Arial;
    font-size:10pt;
}

/*Popup Control*/
.popupControl{
    background-color:White;
    position:absolute;
    visibility:hidden;
}

/*Reorder List*/
.dragHandle {
    width:10px;
    height:15px;
    background-color:Blue;
    background-image:url(images/bg-menu-main.png);
    cursor:move;
    border:outset thin white;
}

.callbackStyle {
    border:thin blue inset;     
}

.callbackStyle table {
    background-color:#5377A9;   
    color:Black;
}


.reorderListDemo li {
    list-style:none;
    margin:2px;
    background-image:url(images/bg_nav.gif);
    background-repeat:repeat-x;
    color:#FFF;
}

.reorderListDemo li a {color:#FFF !important; font-weight:bold;}

.reorderCue {
    border:dashed thin black;
    width:100%;
    height:25px;
}

.itemArea {
    margin-left:15px;
    font-family:Arial, Verdana, sans-serif;
    font-size:1em;
    text-align:left;
}


/* Rounded Corners*/

.roundedPanel
{   
    width:300px;    
    background-color:#5377A9;   
    color:white;
    font-weight:bold;       
}

/* ResizableControl */

.frameImage
{
    width:130px;
    height:65px;
    overflow:hidden;
    float:left;
    padding:3px;
}

.frameText
{
    width:100px;
    height:100px;
    overflow:auto;
    float:left;
    background-color:#ffffff;
    border-style:solid;
    border-width:2px;
    border-color:Gray;
    font-family:Helvetica;
    line-height:normal;
}

.handleImage
{
    width:15px;
    height:16px;
    background-image:url(images/HandleHand.png);
    overflow:hidden;
    cursor:se-resize;
}

.handleText
{
    width:16px;
    height:16px;
    background-image:url(images/HandleGrip.png);
    overflow:hidden;
    cursor:se-resize;
}

.resizingImage
{
    padding:0px;
    border-style:solid;
    border-width:3px;
    border-color:#B4D35D;
}

.resizingText
{
    padding:0px;
    border-style:solid;
    border-width:2px;
    border-color:#7391BA;
}

/*Textbox Watermark*/

.unwatermarked {
    height:18px;
    width:148px;
    font-weight:bold;
}

.watermarked {
    height:20px;
    width:150px;
    padding:2px 0 0 2px;
    border:1px solid #BEBEBE;
    background-color:#F0F8FF;
    color:gray;
}   

/* Rating */
.ratingStar {
    font-size: 0pt;
    width: 13px;
    height: 12px;
    margin: 0px;
    padding: 0px;
    cursor: pointer;
    display: block;
    background-repeat: no-repeat;
}

.filledRatingStar {
    background-image: url(Images/FilledStar.png);

}

.emptyRatingStar {
    background-image: url(Images/EmptyStar.png);
}

.savedRatingStar {
    background-image: url(Images/SavedStar.png);
}


/*Toggle Button*/

/*Setup*/
.walkthrough li {padding-bottom:5px;}

/*Using a sample extender*/

/*Creating a new extender*/
.walkthroughNote {
    padding-left:25px;
    font-style:italic;
}

/*Other neat stuff*/





/************ PasswordStrength Related Styles ***********************/
.TextIndicator_TextBox1
{
     background-color:Gray;
     color:White;
     font-family:Arial;
     font-size:x-small;
     font-style:italic;  
     padding: 2px 3px 2px 3px;   
}

.BarIndicator_TextBox2
{
    color:Blue;
    background-color:Blue;
}

.BarBorder_TextBox2
{
    border-style:solid;
    border-width:1px;
    width:200px;
    vertical-align:middle;
}

.TextIndicator_TextBox3
{
     background-color:Blue;
     color:Yellow;
     font-size:small;
     font-variant:small-caps;  
     padding: 2px 3px 2px 3px;   
}

.TextIndicator_TextBox3_Handle
{
    width:16px;
    height:14px;
    background-image:url(images/Question.png);
    overflow:hidden;
    cursor:help;
}

.dynamicPopulate_Normal 
{   
    border:silver 1px inset;
    padding:2px;
    text-align:center;
    height:2em;
    margin:5px;
    width:200px;
}

.dynamicPopulate_Updating 
{
    background-image:url(images/loading.gif);
    background-repeat:no-repeat;
    border:silver 1px inset;
    text-align:center;
    padding:2px;
    height:2em;
    margin:5px;
    width:200px;
}
/************ MaskedEdit Related Styles ***********************/
.MaskedEditFocus
{
    background-color: #ffffcc;
    color: #000000;
}
.MaskedEditMessage
{
    color: #ff0000;
    font-weight: bold;
}
.MaskedEditError
{
    background-color: #ffcccc;
}
.MaskedEditFocusNegative
{
    background-color: #ffffcc;
    color: #000000;
}
.MaskedEditBlurNegative
{
    color: #ff0000;
}

.MyCalendar .ajax__calendar_container {
    border:1px solid #646464;
    background-color: lemonchiffon;
    color: red;
}
.MyCalendar .ajax__calendar_other .ajax__calendar_day,
.MyCalendar .ajax__calendar_other .ajax__calendar_year {
    color: black;
}
.MyCalendar .ajax__calendar_hover .ajax__calendar_day,
.MyCalendar .ajax__calendar_hover .ajax__calendar_month,
.MyCalendar .ajax__calendar_hover .ajax__calendar_year {
    color: black;
}
.MyCalendar .ajax__calendar_active .ajax__calendar_day,
.MyCalendar .ajax__calendar_active .ajax__calendar_month,
.MyCalendar .ajax__calendar_active .ajax__calendar_year {
    color: black;
    font-weight:bold;
}

.validatorCalloutHighlight 
{
    background-color: lemonchiffon; 
}

我收到以下错误：

  

错误1验证（CSS 2.1）：'opacity'不是已知的CSS属性   名称。 C：\ Documents and Settings \ agordon \ My Documents \ Visual Studio   2008 \ WebSites \ WebSite3 \ StyleSheet.css 402 2 C：... \ WebSite3 \   错误2验证（CSS 2.1）：'filter'不是已知的CSS属性   名称。 C：\ Documents and Settings \ agordon \ My Documents \ Visual Studio   2008 \ WebSites \ WebSite3 \ StyleSheet.css 403 2 C：... \ WebSite3 \   错误3验证（CSS 2.1）：'filter'不是已知的CSS属性   名称。 C：\ Documents and Settings \ agordon \ My Documents \ Visual Studio   2008 \ WebSites \ WebSite3 \ StyleSheet.css 427 2 C：... \ WebSite3 \   错误4验证（CSS 2.1）：'opacity'不是已知的CSS属性   名称。 C：\ Documents and Settings \ agordon \ My Documents \ Visual Studio   2008 \ WebSites \ WebSite3 \ StyleSheet.css 428 2 C：... \ WebSite3 \   错误5验证（CSS 2.1）：'lemonchiffon'不是有效值   'background-color'属性。 C：\ Documents and Settings \ agordon \ My   Documents \ Visual Studio   2008 \ WebSites \ WebSite3 \ StyleSheet.css 738 23 C：... \ WebSite3 \   错误6验证（CSS 2.1）：'lemonchiffon'不是有效值   'background-color'属性。 C：\ Documents and Settings \ agordon \ My   Documents \ Visual Studio   2008 \ WebSites \ WebSite3 \ StyleSheet.css 759 23 C：... \ WebSite3 \

有谁知道我做错了什么？

Answer 1

验证错误都很好，因为它们使用了正确的CSS 2.1文档，并尝试在CSS 2.1上下文中验证CSS3属性。

您可能希望构建应用程序绕过CSS错误，无论它们是什么，因为您可以使用Visual将此“错误”转换为警告工作室选项：

在Visual Studio菜单中的

单击：

Tools＆gt; Options...并深入了解Text Editor＆gt; CSS＆gt; Miscellaneous

只需要处理CSS错误as warnings

2013版

Answer 2

您正在根据CSS 2.1验证样式表，但这些属性是CSS3。

将样式表验证更改为CSS3。

Answer 3

您获得的错误是验证错误。尽管得到了所有主流浏览器的支持，但不透明度和过滤器不在CSS 2.1规范中。

Answer 4

我意识到这种反应有点晚，但其他人可能会发现这些信息很有用。

要使VS2010中的过滤器标签警告消失（而不是忽略它），请关闭VS2010并编辑以下文件： C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\Packages\1033\schemas\CSS\css30.xml

您需要将filter属性从枚举更改为复合。

在第387行附近，您应找到以下文字： <cssmd:property-def _locID="filter" _locAttrData="description,syntax" type="enum" ...

将其更改为： <cssmd:property-def _locID="filter" _locAttrData="description,syntax" type="composite" ...

然后重启VS2010。

Answer 5

您需要将其验证为CSS3

http://jigsaw.w3.org/css-validator/#validate_by_input+with_options

执行此操作时，您的opacity样式会出现两个错误，并且会出现一堆处理重复background-colors的警告。