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IE的hasLayout详解

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什么是 haslayout ？　　　　“Layout”是一个 IE/Win 的私有概念，它决定了一个元素如何显示以及约束其包含的内容、如何与其他元素交互和建立联系、如何响应和传递应用程序事件/用户事件等，这有点类似于一个窗体的概念。微软的开发者们认为盒状元素(box-type elements)应该具有一个“属性(property)”(这是面向对象编程中的一个概念)，于是他们便使用了 layout , 也就是 hasLayout。hasLayout 其实既不是一个属性更不是一个行为，而是 IE 这个渲染引擎代代继承一贯拥有的一个渲染概念，在这个概念下渲染的元素将具有一种特性。实际上这种渲染特性在有些 HTML 元素中与身俱来，而在另外一些元素中也可以通过一些 CSS 属性将其触发为 true ，且一旦触发将不可逆转。　　当我们说一个元素“拥有layout”或“得到layout”，或者说一个元素“has layout” 的时候，我们的意思是指它的微软专有属性 hasLayout 被设为了 true 。一个“layout元素”可以是一个默认就拥有 layout 的元素或者是一个通过设置某些 CSS 属性得到 layout 的元素。而“无layout元素”，是指 hasLayout 未被触发的元素，比如一个未设定宽高尺寸的干净 div 元素就可以做为一个 “无layout祖先”

Hiding an element completly that has had some overflow hidden

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问题 Basically I have a parent div with height and width and overflow:hidden and then within that some more divs with it. We are dealing with fluid content and some of the divs go over the corners so get hidden. But one is half and half. Is there a way to make that completely hidden? CSS would be best. 回答1: I don't think you can know if a child from an overflow:hidden parent is in the hidden or visible section without using Javascript (I might be wrong here). What I suggest is that you set all the

Do we ignore overflow in Two's Complement

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I'm trying to wrap my head around overflow within twos complement for example say I'm trying to take away these two binary numbers: 1111 1000 0100 - 010 111 001 000 I convert the 2nd binary number to it's two complement equivalent and then simply add it but I noticed it resulted in an overflow of 1, do I simply ignore the overflow? or is there a rule I must follow 1111 1000 0100 + 1010 0011 1000 = (1) 1001 1011 1100 Short answer: if you are performing arithmetic on fixed-width binary numbers, using two's complement representation for negative numbers, then yes, you ignore the one-bit overflow.

Is this an overflow arithmetic calculation?

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So when I read the book and it says that overflow can't occur when add different signs and subtraction of the same sign. But I have question when I do this: 185 - 122 I converted binary of 122 to 2s complement and did the addition, which is different signs: 185+(-122) and when I add them together, I got the sign bit overflow to 100111111. But if I cut off the MSB on the left, it is the correct answer. Is it an overflow? No, it isn't overflow - the overflow resulting from the addition of 2 1's in the MSB must just be discarded. From Wikipedia To get the two's complement of a binary number, the

CSS 浮动和定位（new）

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CSS浮动 1、网页的布局方式（1）标准流（文档流）排版块级元素垂直排版；行内和行内块级是水平排版；（2）浮动流排版是一种半脱离标准流的排版方式；浮动流只有水平排版，设置相对于父级元素的左对齐或者右对齐，没有 center，不可以使用 margin：0 auto；浮动流不区分块级和行内元素，更类似于行内块级元素的特点，即可水平排版又可以设置宽高；（3）定位流排版 2、浮动（float）（1）浮动元素脱标定义：浮动的元素脱离标准流，像是从标准流里被删除了一样；影响：会造成元素的覆盖问题；（2）浮动元素排序规则相同方向，先浮动的在前；不同方向，左浮找左，右浮找右；元素浮动后的位置与浮动前的位置相关：浮动前在第几行浮动后就在第几行，这里的浮动前的位置是在前面的元素都浮动之后的位置；浮动是有顺序的浮动；（3）浮动贴靠和字围现象贴靠：父元素的宽度不够，浮动元素会逐级往上贴靠，都不够放的话，会一直贴到最上级的父元素；字围：浮动元素不会覆盖文字，文字会自动围绕在浮动元素的周围；（4）浮动在网页排版的应用网页的排版：垂直方向标准流，水平方向浮动流；网页的排版练习清除浮动 –浮动前 [外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-lyNNnl60-1571899607619)(data:image/gif;base64

CSS Flexbox: a centered child overflows a parent with position fixed

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How can I properly center the #content without overflowing the #container ? margin: auto kinda works, but looks like a hack to me, I would like not to use any margins with CSS Flexbox. Keep in mind that the #container has position: fixed . Here's the code demonstrates the issue: [View in JSFiddle ↗] document.getElementById('content').innerHTML = [...Array(100).keys()].join('<br>') #container { position: fixed; background: lightblue; top: 0; bottom: 0; left: 0; right: 0; display: flex; align-items: center; justify-content: center; overflow: auto; } #content { border: 1px solid green; /*

Display element outside the nested div while visibility stays hidden

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I want to achieve this. Keep an eye on the top text 'Happy Fruit' . I want to be overlayed of the box while it's nested inside it. body { background: yellow; padding: 50px; } .slider { width: 100%; height: 650px; margin-top: 40px; background: orange; box-shadow: 0 0 78px 11px #F3286B; } h1, h2 { text-transform:uppercase; color: red; } h1 { font-size: 11vw; } h2 { font-size: 7vw; } <body> <div class="slider"> <h1> Happy Fruit </h1> <h2> HELLO WORLD </h2> </div> </body> If I then go and add a margin-top: -50px; to the h1 the text will stay inside the div, but how can I make it going above

Flexbox align-items overflow text get cuts off at top [duplicate]

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This question already has an answer here: Can't scroll to top of flex item that is overflowing container 7 answers How to use safe center with flexbox? 1 answer I have the following situation, the text get cuts off at the top when it not longer fits inside the container. What can I do to fix that? I'd still like the text to be centered if it's smaller than the container, and I can't change the container size. div { display: flex; align-items: center; width: 100px; height: 50px; overflow: auto; word-break: break-word; } <div> sdjhfkahsdkjfadsfhk jaskjfsj fsldflkasjklsjflakj

Overflowing a container div horizontally but not vertically

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问题 I'm working on a website that uses two columns inside a container. The container has a white background that should stretch to the bottom of whichever column is highest, so I'm using the holy grail method for that. However, both columns should positioned so that a part of it exceeds the white background (this example uses a fixed height, which should be fluid). As far as I know, this can only be done by setting the overflow to visible but this break the equal height of the columns. How do I

HTML `dialog` element: scroll content independently of background

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I am trying to use the dialog element. When the dialog/modal is closed, the body should be scrollable. When the dialog/modal is open, if it has large contents, the dialog/modal should be scrollable. However, when the dialog/modal is open, I don't want scroll to apply to both the dialog/modal and the body background, which is what it seems to do by default. Example: https://output.jsbin.com/mutudop/3 . How can I make scroll apply only to the dialog/modal contents, when the dialog/modal is open? Note: I am only interested in solutions using the native dialog element. So I tried it as well and

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