An example of how margin is assigned a negative value
1. Margin-top is a negative pixel.
margin-top is a negative pixel. The offset value is relative to itself. Subsequent elements are affected. See the following code:
1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4 <meta charset="UTF-8" /> 5 <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6 <title>margin不同赋值情况（负值，百分数）</title> 7 <style type="text/css"> 8 *{ 9 margin: 0;10 padding: 0;11 }12 /*父元素样式*/13 .p{14 margin: 100px;15 width: 500px;16 height: 500px;17 border: 1px solid red;18 }19 .c1{20 width: 200px;21 height: 200px;22 border: 1px solid blue;23 /*margin-top为负值像素，偏移值相对于自身，其后元素受影响*/24 margin-top: -20px;25 }26 .c2{27 width: 200px;28 height: 200px;29 border: 1px solid blue;30 }31 </style>32 </head>33 <body>34 <div class="p">35 <div class="c1">36 子元素137 </div>38 <div class="c2">39 子元素2（元素2跟着上移了）40 </div>41 </div>42 </body>43 </html>Effect:
2. Margin-left is a negative value pixel
margin-left is a negative value Pixel, the offset value is relative to itself, subsequent elements are not affected, see the following code:
1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4 <meta charset="UTF-8" /> 5 <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6 <title>margin不同赋值情况（负值，百分数）</title> 7 <style type="text/css"> 8 *{ 9 margin: 0;10 padding: 0;11 }12 /*父元素样式*/13 .p{14 margin: 100px;15 width: 500px;16 height: 500px;17 border: 1px solid red;18 }19 .c1{20 width: 200px;21 height: 200px;22 border: 1px solid blue;23 /*margin-left为负值像素，偏移值相对于自身，其后元素不受影响*/24 margin-left: -20px;25 }26 .c2{27 width: 200px;28 height: 200px;29 border: 1px solid blue;30 }31 </style>32 </head>33 <body>34 <div class="p">35 <div class="c1">36 子元素137 </div>38 <div class="c2">39 子元素2（子元素2不受影响）40 </div>41 </div>42 </body>43 </html>Effect:
1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4 <meta charset="UTF-8" /> 5 <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6 <title>margin不同赋值情况（负值，百分数）</title> 7 <style type="text/css"> 8 *{ 9 margin: 0;10 padding: 0;11 }12 /*父元素样式*/13 .p{14 margin: 100px;15 width: 500px;16 height: 500px;17 border: 1px solid red;18 }19 .c1{20 width: 200px;21 height: 200px;22 border: 1px solid blue;23 /*margin-top为负值百分数，偏移值相对于父元素，其后元素受影响*/24 margin-top: -20%;25 }26 .c2{27 width: 200px;28 height: 200px;29 border: 1px solid blue;30 }31 </style>32 </head>33 <body>34 <div class="p">35 <div class="c1">36 子元素137 </div>38 <div class="c2">39 子元素2（子元素2受影响）40 </div>41 </div>42 </body>43 </html>
1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4 <meta charset="UTF-8" /> 5 <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6 <title>margin不同赋值情况（负值，百分数）</title> 7 <style type="text/css"> 8 *{ 9 margin: 0;10 padding: 0;11 }12 /*父元素样式*/13 .p{14 margin: 100px;15 width: 500px;16 height: 500px;17 border: 1px solid red;18 }19 .c1{20 width: 200px;21 height: 200px;22 border: 1px solid blue;23 /*margin-left为负值百分数，偏移值相对于父元素，其后元素不受影响*/24 margin-left: -20%;25 }26 .c2{27 width: 200px;28 height: 200px;29 border: 1px solid blue;30 }31 </style>32 </head>33 <body>34 <div class="p">35 <div class="c1">36 子元素137 </div>38 <div class="c2">39 子元素2（子元素2不受影响）40 </div>41 </div>42 </body>43 </html>
##5 ,
margin-right is a negative value pixel and does not set the width, no offset value, and subsequent elements are not affected , its own width becomes larger, see the following code:
1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4 <meta charset="UTF-8" /> 5 <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6 <title>margin不同赋值情况（负值，百分数）</title> 7 <style type="text/css"> 8 *{ 9 margin: 0;10 padding: 0;11 }12 /*父元素样式*/13 .p{14 margin: 100px;15 width: 500px;16 height: 500px;17 border: 1px solid red;18 }19 .c1{20 /*关键点:不设置宽度*/21 /*width: 200px;*/22 height: 200px;23 border: 1px solid blue;24 /*margin-right为负值像素且不设置宽度，无偏移值，其后元素不受影响*/25 margin-right: -100px;26 }27 .c2{28 width: 200px;29 height: 200px;30 border: 1px solid blue;31 }32 </style>33 </head>34 <body>35 <div class="p">36 <div class="c1">37 子元素138 </div>39 <div class="c2">40 子元素2（子元素2不受影响）41 </div>42 </div>43 </body>44 </html>
6 , margin-right is a negative percentage and does not set the width
margin-right is a negative percentage and does not set the width, no offset value, the own width becomes wider (the width value is the width value of the parent element * percentage) , subsequent elements will not be affected, see the following code:
1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4 <meta charset="UTF-8" /> 5 <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6 <title>margin不同赋值情况（负值，百分数）</title> 7 <style type="text/css"> 8 *{ 9 margin: 0;10 padding: 0;11 }12 /*父元素样式*/13 .p{14 margin: 100px;15 width: 500px;16 height: 500px;17 border: 1px solid red;18 }19 .c1{20 /*关键点:不设置宽度*/21 /*width: 200px;*/22 height: 200px;23 border: 1px solid blue;24 /*margin-right为负值百分数且不设置宽度，无偏移值,自身宽度变宽(宽度值为父元素宽度值*百分比)，其后元素不受影响*/25 margin-right: -20%;26 }27 .c2{28 width: 200px;29 height: 200px;30 border: 1px solid blue;31 }32 </style>33 </head>34 <body>35 <div class="p">36 <div class="c1">37 子元素138 </div>39 <div class="c2">40 子元素2（子元素2不受影响）41 </div>42 </div>43 </body>44 </html>Effect:
##7, margin-bottom: It is a negative value pixel 
1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4 <meta charset="UTF-8" /> 5 <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6 <title>margin不同赋值情况（负值，百分数）</title> 7 <style type="text/css"> 8 *{ 9 margin: 0;10 padding: 0;11 }12 /*父元素样式*/13 .p{14 margin: 100px;15 width: 500px;16 height: 500px;17 border: 1px solid red;18 }19 .c1{20 width: 200px;21 height: 200px;22 border: 1px solid blue;23 /*margin-bottom:为负值像素，自身无偏移值,，其后元素受影响(上移了)*/24 margin-bottom: -100px;25 }26 .c2{27 width: 200px;28 height: 200px;29 border: 1px solid blue;30 }31 </style>32 </head>33 <body>34 <div class="p">35 <div class="c1">36 子元素137 </div>38 <div class="c2">39 子元素2（子元素2受影响,上移了）40 </div>41 </div>42 </body>43 </html> 
, margin-bottom: is a negative percentage
margin-bottom: It is a negative percentage and has no offset value. Subsequent elements are affected (moved up, and the size of the moved up is the width value of the parent element * 20%) , see the following code:
1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4 <meta charset="UTF-8" /> 5 <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6 <title>margin不同赋值情况（负值，百分数）</title> 7 <style type="text/css"> 8 *{ 9 margin: 0;10 padding: 0;11 }12 /*父元素样式*/13 .p{14 margin: 100px;15 width: 800px;16 height: 500px;17 border: 1px solid red;18 }19 .c1{20 width: 200px;21 height: 200px;22 border: 1px solid blue;23 /*margin-bottom:为负值百分数，自身无偏移值,，其后元素受影响(上移了,上移大小为父元素宽度值*20%)*/24 margin-bottom: -20%;25 }26 .c2{27 width: 200px;28 height: 200px;29 border: 1px solid blue;30 }31 </style>32 </head>33 <body>34 <div class="p">35 <div class="c1">36 子元素137 </div>38 <div class="c2">39 子元素2（子元素2受影响,上移了）40 </div>41 </div>42 </body>43 </html>Effect:
Summary: The above is the case where margin is assigned a negative value, which can offset itself (or not offset), and subsequent elements will be affected (or not affected) , as its width increases (or does not increase), there will be many different application scenarios, please choose wisely.
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