css的默认值

呵呵

滚动条的默认宽度

屏幕分辨率（宽度）
IE6（滚动条宽度，下同）
IE7
Firefox2
标准
最大化
标准
最大化
标准
最大化
800px
28px
12px
20px
16px
24px
16px
1024px
20px
12px
20px
16px
16px
16px
1280px
20px
12px
20px
16px
16px
16px
1440px
20px
12px
20px
16px
16px
16px

P{  

display: block;  -webkit-margin-before: 1em;  -webkit-margin-after: 1em;  -webkit-margin-start: 0px;  -webkit-margin-end: 0px;

}

<div class="styles-section-title styles-selector" style="box-sizing: border-box; word-wrap: break-word; cursor: text; color: rgb(34, 34, 34); font-family: Consolas, 'Lucida Console', monospace;"><div style="box-sizing: border-box;"><span class="selector" style="box-sizing: border-box; color: rgb(136, 136, 136);"><span class="simple-selector selector-matches" style="box-sizing: border-box; color: rgb(34, 34, 34);">h1</span></span><span style="box-sizing: border-box;"> {</span></div></div><ol tabindex="0" class="style-properties monospace" style="box-sizing: border-box; font-family: Consolas, 'Lucida Console', monospace; margin: 0px; padding: 2px 4px 0px 0px; list-style: none; clear: both; color: rgb(34, 34, 34); white-space: nowrap;"><li style="box-sizing: border-box; margin-left: 0px !important; padding-left: 38px; white-space: normal; text-overflow: ellipsis; overflow: hidden; cursor: auto;"><input class="enabled-button" type="checkbox" style="font-family: inherit; font-size: 10px; visibility: hidden; float: left; margin: 0px; vertical-align: top; position: relative; z-index: 1; width: 18px; left: -40px; top: 1px;" /><span class="styles-clipboard-only" style="box-sizing: border-box; display: inline-block; width: 0px; opacity: 0; pointer-events: none; white-space: pre;">  </span><span title="display: block;" style="box-sizing: border-box; color: rgb(200, 0, 0); margin-left: -38px;">display</span>: <span class="expand-element" style="box-sizing: border-box;"></span><span class="value" style="box-sizing: border-box;">block</span>;</li><li style="box-sizing: border-box; margin-left: 0px !important; padding-left: 38px; white-space: normal; text-overflow: ellipsis; overflow: hidden; cursor: auto;"><input class="enabled-button" type="checkbox" style="font-family: inherit; font-size: 10px; visibility: hidden; float: left; margin: 0px; vertical-align: top; position: relative; z-index: 1; width: 18px; left: -40px; top: 1px;" /><span class="styles-clipboard-only" style="box-sizing: border-box; display: inline-block; width: 0px; opacity: 0; pointer-events: none; white-space: pre;">  </span><span title="font-size: 2em;" style="box-sizing: border-box; color: rgb(200, 0, 0); margin-left: -38px;">font-size</span>: <span class="expand-element" style="box-sizing: border-box;"></span><span class="value" style="box-sizing: border-box;">2em</span>;</li><li style="box-sizing: border-box; margin-left: 0px !important; padding-left: 38px; white-space: normal; text-overflow: ellipsis; overflow: hidden; cursor: auto;"><input class="enabled-button" type="checkbox" style="font-family: inherit; font-size: 10px; visibility: hidden; float: left; margin: 0px; vertical-align: top; position: relative; z-index: 1; width: 18px; left: -40px; top: 1px;" /><span class="styles-clipboard-only" style="box-sizing: border-box; display: inline-block; width: 0px; opacity: 0; pointer-events: none; white-space: pre;">  </span><span title="-webkit-margin-before: 0.67em;" style="box-sizing: border-box; color: rgb(200, 0, 0); margin-left: -38px;">-webkit-margin-before</span>: <span class="expand-element" style="box-sizing: border-box;"></span><span class="value" style="box-sizing: border-box;">0.67em</span>;</li><li style="box-sizing: border-box; margin-left: 0px !important; padding-left: 38px; white-space: normal; text-overflow: ellipsis; overflow: hidden; cursor: auto;"><input class="enabled-button" type="checkbox" style="font-family: inherit; font-size: 10px; visibility: hidden; float: left; margin: 0px; vertical-align: top; position: relative; z-index: 1; width: 18px; left: -40px; top: 1px;" /><span class="styles-clipboard-only" style="box-sizing: border-box; display: inline-block; width: 0px; opacity: 0; pointer-events: none; white-space: pre;">  </span><span title="-webkit-margin-after: 0.67em;" style="box-sizing: border-box; color: rgb(200, 0, 0); margin-left: -38px;">-webkit-margin-after</span>: <span class="expand-element" style="box-sizing: border-box;"></span><span class="value" style="box-sizing: border-box;">0.67em</span>;</li><li style="box-sizing: border-box; margin-left: 0px !important; padding-left: 38px; white-space: normal; text-overflow: ellipsis; overflow: hidden; cursor: auto;"><input class="enabled-button" type="checkbox" style="font-family: inherit; font-size: 10px; visibility: hidden; float: left; margin: 0px; vertical-align: top; position: relative; z-index: 1; width: 18px; left: -40px; top: 1px;" /><span class="styles-clipboard-only" style="box-sizing: border-box; display: inline-block; width: 0px; opacity: 0; pointer-events: none; white-space: pre;">  </span><span title="-webkit-margin-start: 0px;" style="box-sizing: border-box; color: rgb(200, 0, 0); margin-left: -38px;">-webkit-margin-start</span>: <span class="expand-element" style="box-sizing: border-box;"></span><span class="value" style="box-sizing: border-box;">0px</span>;</li><li style="box-sizing: border-box; margin-left: 0px !important; padding-left: 38px; white-space: normal; text-overflow: ellipsis; overflow: hidden; cursor: auto;"><input class="enabled-button" type="checkbox" style="font-family: inherit; font-size: 10px; visibility: hidden; float: left; margin: 0px; vertical-align: top; position: relative; z-index: 1; width: 18px; left: -40px; top: 1px;" /><span class="styles-clipboard-only" style="box-sizing: border-box; display: inline-block; width: 0px; opacity: 0; pointer-events: none; white-space: pre;">  </span><span title="-webkit-margin-end: 0px;" style="box-sizing: border-box; color: rgb(200, 0, 0); margin-left: -38px;">-webkit-margin-end</span>: <span class="expand-element" style="box-sizing: border-box;"></span><span class="value" style="box-sizing: border-box;">0px</span>;</li><li style="box-sizing: border-box; margin-left: 0px !important; padding-left: 38px; white-space: normal; text-overflow: ellipsis; overflow: hidden; cursor: auto;"><input class="enabled-button" type="checkbox" style="font-family: inherit; font-size: 10px; visibility: hidden; float: left; margin: 0px; vertical-align: top; position: relative; z-index: 1; width: 18px; left: -40px; top: 1px;" /><span class="styles-clipboard-only" style="box-sizing: border-box; display: inline-block; width: 0px; opacity: 0; pointer-events: none; white-space: pre;">  </span><span title="font-weight: bold;" style="box-sizing: border-box; color: rgb(200, 0, 0); margin-left: -38px;">font-weight</span>: <span class="expand-element" style="box-sizing: border-box;"></span><span class="value" style="box-sizing: border-box;">bold</span>;</li></ol><div style="box-sizing: border-box; color: rgb(34, 34, 34); font-family: Consolas, 'Lucida Console', monospace; white-space: nowrap;">}</div>