padding | 易学教程

CSS padding margin border属性详解

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图解CSS padding、margin、border属性 W3C组织建议把所有网页上的对像都放在一个盒(box)中，设计师可以通过创建定义来控制这个盒的属性，这些对像包括段落、列表、标题、图片以及层。盒模型主要定义四个区域：内容(content)、内边距(padding)、边框(border)和外边距(margin)。对于初学者，经常会搞不清楚margin，background-color，background-image，padding，content，border之间的层次、关系和相互影响。这里提供一张盒模型的3D示意图，希望便于你的理解和记忆。 margin：层的边框以外留的空白 background-color：背景颜色 background-image：背景图片 padding：层的边框到层的内容之间的空白 border：边框 content：内容接下来将讲述HTML和CSS的关键——盒子模型(Box model)。理解Box model的关键便是margin和padding属性，而正确理解这两个属性也是学习用css布局的关键。注: 为什么不翻译margin和padding? 原因一: 在汉语中并没有与之相对应的词语；原因二: 即使有这样的词语, 由于在编写css代码时, 必须使用margin和padding, 如果我们总用汉语词语代替其来解释的话,

Is struct packing deterministic?

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问题 For example, say I have two equivalent structs a and b in different projects: typedef struct _a { int a; double b; char c; } a; typedef struct _b { int d; double e; char f; } b; Assuming I haven't used any directives like #pragma pack and these structs are compiled on the same compiler on the same architecture, will they have identical padding between variables? 回答1: The compiler is deterministic; if it weren't, separate compilation would be impossible. Two different translation units with

Removing Image Button Padding (Android)

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问题 I have Buttons that look like the top image for the landscape orientation: I want it to look like the bottom image. Here's my .xml code for these buttons. <TableRow android:id="@+id/tableRow7" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:weightSum="1.0" > <ImageButton android:id="@+id/appHome" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight=".5" android:background="@null" android

How to force Firefox to render textarea padding the same as in a div?

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问题 I'm attempting to provide a consistent width per line in pixels inside of a textarea across IE8, Firefox and Safari, so that text content wraps lines as predictably and consistently as possible. Firefox is doing something a little bit odd: it has an extra pixel of padding eating out of the content space of the textarea vs the other two browsers, and vs a similarly equipped div block. When applying this class to both a textarea and a div the difference is visible, with the text in the div

Form padding differences in Firefox and Opera/Chrome/IE

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问题 I'm having a problem with the padding in my form on my website. If I've set a height/width to a form element and then adds a padding to it. In all browsers I've tried, except Firefox, the padding is added to the height/width. If I have a input with 200 in width and 20px in height. and padding at 5 (all ways), the sum and total width and height would be 210px and 30px, but in Firefox it is 200px and 20px. How do I work my way around this? 回答1: Give the input this CSS: box-sizing: border-box;

What are the cipher padding strings in java

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问题 Everyone talks about the padding schemes in ciphers but what are the actual strings one needs to pass in to the cipher? I don't care if they are symmetric or asymmetric, I just want a list of the possible values. 回答1: There are many types of padding, PKCS-7, Zero, ISO 10126, ANSI X.923, etc. I suggest you read up on padding since you seem not to fully understand the concept. Then there's the possibility you are referring to cryptographic salt. Edit Every implementation of the Java platform is

css3 box-sizing属性

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css3 box-sizing属性 box-sizing属性可以为三个值之一：content-box（default），border-box，padding-box。 content-box，border和padding不计算入width之内 padding-box，padding计算入width内 border-box，border和padding计算入width之内，其实就是怪异模式了~ ie8+浏览器支持content-box和border-box； ff则支持全部三个值。使用时： -webkit-box-sizing: 100px; // for ios-safari, android -moz-box-sizing:100px; //for ff box-sizing:100px; //for other 栗子： <style type="text/css"> .content-box{ box-sizing:content-box; -moz-box-sizing:content-box; width: 100px; height: 100px; padding: 20px; border: 5px solid #E6A43F; background: blue; } .padding-box{ box-sizing:padding-box; -moz-box

Remove all padding and margin table HTML and CSS

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问题 I have this table : <body> <table id="page" > <tr id="header" > <td colspan="2" id="tdheader" >je suis</td> </tr> <tr> <td>1</td> <td>2</td> </tr> </table> </body> and here is the css html, body, #page { height:100%; width:100%; margin:0; padding:0; } #header { margin:0; padding:0; height:20px; background-color:green; } and I want to remove all margin and padding but always I have that : How can I resolve this? 回答1: Try to use this CSS: /* Apply this to your `table` element. */ #page { border

Is there a way to completely eliminate padding in a LinearLayout containing buttons?

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问题 I tried the following to try to display two buttons in a horizontal linear layout, with the edges of the buttons flush with the border of the linear layout. To my surprise, I found that there is always still padding between the buttons and the left, right and bottom edges of the linear layout. Only the top edges of the buttons end up flush with the border of the linear layout. Why is that? And is there a way to control this behavior? Thanks much. <LinearLayout android:orientation="horizontal"

NumericUpDown with Unit | Custom control | Field padding

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问题 Im trying to create a custom control that inherits NumericUpDown to show a settable unit. This is (visually) what I've got so far: My Code: Looks a bit long, but isnt doing that much class NumericUpDownUnit : NumericUpDown { public event EventHandler ValueChanged; /// <summary> /// Constructor creates a label /// </summary> public NumericUpDownUnit() { this.TextChanged += new EventHandler(TextChanged_Base); this.Maximum = 100000000000000000; this.DecimalPlaces = 5; this.Controls.Add(lblUnit);