z-index | 易学教程

How to move svg elements over html5 video and control video playback at the same time?

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问题 <video id="video" width="600px" height="400px" autoplay playinline muted loop controls src="test.mp4"> </video> <svg id="svg" width="600" height="400" style="position: absolute; left:8px; background:gray;opacity:0.5"> </svg> <script> let svg_element = document.getElementById("svg"); let svgns = "http://www.w3.org/2000/svg"; setInterval(() => { let player_element = document.createElementNS(svgns, 'circle'); player_element.setAttribute("id", "player"); player_element.setAttribute("cx", 100);

Z-index: make element go under its parent's sibling

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问题 Imagine this DOM: <header> <h1> header </h1>  <nav> nav </nav> </header> <div> content </div> Both header and nav are positioned as fixed . The content div is positioned as relative . I need to create a stack, with z-index, in this order (from top to bottom): header *:not(nav) content nav I'm having a hard time putting nav in the bottom (in other words, under its parent's sibling). I'm thinking that all header's children have to go either on top or under its sibling...

z-index not working very well in ipad

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问题 I am building a site for a friend (http://pasionesargentas.com/sm/) with the fullscreen gallery with thumbnail flip (http://tympanus.net/codrops/2011/02/09/fullscreen-gallery-with-thumbnail-flip/). I didn't quite like the idea of the flip thing so I simply preferred to disable it and add a menu instead. The menu div css is something like #top { position:fixed; background: transparent; display: block; z-index: 99999; } It works fine in Chrome, Safari, Explorer and Opera. But for some reason

JavaScript set z-index on click

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问题 I made a website which consists of a display area that randomly spawns 50 circular <div> elements. I want to make it so when one of the circles is clicked, it comes to the foreground. I thought using the addEventListener function on each circle as it's created would work but I can't get it to do anything. Thank you. HTML <!DOCTYPE html> <html> <head lang="en"> <meta charset="utf-8"> <title></title> <link rel="stylesheet" type="text/css" href="index_styling.css"> <script type="text/javascript"

Background object is drawn in front of foreground object in OpenGL?

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问题 For testing purposes let's assume I've draw 2 teapots with glutSolidTeapot() , like this: glColor3f(1.0f, 0.0f, 0.0f); // Red teapot glutWireTeapot(1.0f); glColor3f(0.0f, 1.0f, 0.0f); // Green teapot glTranslatef(0.0f, 0.0f, 3.0f); glutWireTeapot(1.0f); The camera is initially located at (x,y,z) = (0.0f, 0.0f, 5.0f) and I'm looking at z = -1 (this is camera position #1). I'm sure you understand that the green teapot is the closest object to the camera and the red one is behind it. The problem

YUI Autocomplete renders under other page elements in IE7

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问题 I'm working now on a page that has a column of boxes styled with sexy shadows and corners and whatnot using the example here. I have to admit, I don't fully understand how that CSS works, but it looks great. Inside the topmost box is a text-type input used for searching. That search box is wired up to a YUI autocomplete widget. Everything works fine in Firefox3 on Mac, FF2 on Windows, Safari on Mac. In IE7 on WinXP, the autocomplete suggestions render underneath the round-cornered boxes,

Select DIV with highest z-index

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问题 Example code so I can start explaining this problem: <div style="z-index:5">5</div> <div style="z-index:2">2</div> <div style="z-index:1">1</div> <div style="z-index:4">4</div> <div style="z-index:3">3</div> (z-index values do not matter, and their order, even less. Just example code) Problem: I want to select (either using CSS or JS with jQuery) the DIV with highest z-index value. In the case above, I want to select the first one, because it's z-index 5 is higher than all the others' z

Programmatically set console window size and position

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问题 I would like to open multiple console programs on my desktop. This is what I have to do everytime: 1.Right click Desktop->Screen resolution->Detect (4 monitors). 2.Open 16 different console programs (4 per screen). 3.Clicking on all windows to get the Z-order correctly. 3.Right click Taskbar->Show Windows Stacked (to organize all 16 windows to perfect squares, 4 on each screen in order of z-index). Is there a way to do even just a part of this programmatically to help this go quicker? 回答1:

Programmatically set console window size and position

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HTML连载62-固定定位练习、z-index属性

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一、固定定位应用场景 1.练习 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>D158_ExerciseOfLocation</title> <style> *{ padding:0; margin:0; } .nav{ width: 100%; height: 45px; background-color: red; background:url("image/play_tennis.jpg"); position:fixed;/*复习了固定定位，这个导航条就会固定到浏览器中不会随网页滚动而滚动了，兵器也脱脱离的标准流*/ } .content{ width: 100%; height: 2500px; background-color: yellow; background:url("image/laptop.jpg"); } .backup{ width: 50px; /*height: 50px;*/ background-color: red; position:fixed; right: 10px; bottom:10px; text-align: center; text-decoration: none;/*去掉下面的线*/ line-height: 50px;/