css3

问题 This question already has answers here : Absolutely positioned flex item is not removed from the normal flow in IE11 (4 answers) Closed 2 years ago . I'm currently trying to build a responsive website layout with flexbox. Depending on the screen size I want an element to have position: fixed; This itself is working. But when I use justify-content: space-between; on a column that contains an element that gets moved out of the of column itself with position: fixed; the space distribution uses

问题 I am trying to have CSS variables for box model properties. I want to support both setting a value for all sides as well as individual sides. I want to have default values, but be override-able either way. I tries using fallback values, but with little success. Something like: :root { --border-width-top: 0; --border-width-right: 0; --border-width-bottom: 0; --border-width-left: 0; --border-width: 0; } div { border-color: red; border-style: solid; border-width: var(--border-width, var(--border

问题 I am trying to animate an SVG in image/object tag but it is not working svg { width: 100%; height: 200px; } .rotate-45 { transform-origin: center; transform: rotate(45deg); } .rotate { transform-origin: center; animation: rotate 1s ease-in-out infinite; } .rotate-back { transform-origin: center; animation: rotate 1s ease-in-out infinite; animation-direction: alternate; } .left { animation: move 1s ease-in-out infinite; } .right { animation: move 1s ease-in-out infinite; } @keyframes rotate {

问题 I'd like to calculate the number of rows in a grid template using calc() , but trying to get the repeat count with division isn't working: .grid { display: grid; grid-gap: 10px; grid-template-columns: 1fr; margin-bottom: 10px; background: rgba(0, 0, 0, 0.2); } .grid>div { background: tomato; width: 20px; text-align: center; margin: auto; } .grid.no-calc { grid-template-rows: repeat(3, 30px); } .grid.addition { grid-template-rows: repeat(calc(1 + 2), 30px); } .grid.subtraction { grid-template

问题 I’m trying some experiments with CSS vars, and I couldn’t get this to work or find any documentation about it. Does anyone know if it’s possible to use a CSS var in a CSS3 selector? I made the following example to explain what I’m trying to do. This example is Chrome only. JSFIDDLE http://jsfiddle.net/68Rrn/ CSS :root { -webkit-var-count: 5; /* define my var! */ } li { width:100px; height:100px; background-color:blue; display:inline-block; list-style:none; } ul li:nth-child(4) { background

问题 I'm wondering if someone can help with this problem. I spent a lot of time on it and I'm all out of ideas, I've tried various suggestions from Google results, various combinations of flex grow and shrink, and couldn't get it working. Demo: https://embed.plnkr.co/dIPh53W4DBkmTB51DCHp/ (open with IE 11) Edit the code: https://plnkr.co/edit/dIPh53W4DBkmTB51DCHp?p=preview In this case, in tablet view the <ul> flex width should be 90%, but in desktop view the <ul> flex width should only be 55%.

问题 I'm wondering if someone can help with this problem. I spent a lot of time on it and I'm all out of ideas, I've tried various suggestions from Google results, various combinations of flex grow and shrink, and couldn't get it working. Demo: https://embed.plnkr.co/dIPh53W4DBkmTB51DCHp/ (open with IE 11) Edit the code: https://plnkr.co/edit/dIPh53W4DBkmTB51DCHp?p=preview In this case, in tablet view the <ul> flex width should be 90%, but in desktop view the <ul> flex width should only be 55%.

问题 I have an tag which is displayed as a block. On page load, its width is increased by a css animation from zero to some percentage of the containing div (the fiddle contains a MWE, but there is more than one link in this div, each with a different width). On hover, I want it to change colour, change background colour, and also expand to 100% of the div, using a CSS transition . The colour and background colour bit is working, but it seems to ignore the width transition. Snippet: .home-bar {

问题 I completely understand that you cannot group animation keyframes selectors such as @keyframes, @-moz-keyframes, @-webkit-keyframes { /*do something*/ } and that you absolutely MUST do @keyframes { /*do something*/ } @-moz-keyframes { /*do something*/ } @-webkit-keyframes { /*do something*/ } I know there are pre-processors that can do all this for me. But I am more interested in the reason behind why this is the case? My google-fu is failing me. It seems to always direct me to a

问题 I have an tag which is displayed as a block. On page load, its width is increased by a css animation from zero to some percentage of the containing div (the fiddle contains a MWE, but there is more than one link in this div, each with a different width). On hover, I want it to change colour, change background colour, and also expand to 100% of the div, using a CSS transition . The colour and background colour bit is working, but it seems to ignore the width transition. Snippet: .home-bar {