Pour le petit défi de Hugo Giraudel :D
Created
February 26, 2014 16:39
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A Pen by ffoodd.
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<ul class="boxes"> | |
<li class="box box-alpha"> | |
<header class="box-header">Cross-browser : the circle works from Opera 15, Chrome 23, Firefox 17.</header> | |
<footer class="box-footer">Firefox between 4 and 17 does clip the circle, but does not vertically center it…</footer> | |
</li> | |
<li class="box box-beta"> | |
<header class="box-header">The square fallback works from Opera 10.6, Chrome 14, IE9 — IE8 not centered, Safari 1.</header> | |
<footer class="box-footer"></footer> | |
</li> | |
<li class="box box-gamma"> | |
<header class="box-header"></header> | |
<footer class="box-footer">IE7 gracefully degrades with no generated content.</footer> | |
</li> | |
<li class="box box-delta"> | |
<header class="box-header"></header> | |
<footer class="box-footer">To do : check if Firefox could clip without SVG (flag ?); test how to clip SVG with relatives dimensions and remove this max-width: 800px.</footer> | |
</li> | |
</ul> | |
<div class="text"> | |
<h2>What you should know</h2> | |
<ol> | |
<li><strong>Chrome’s good. That’s it.</strong></li> | |
<li>Firefox’ not bad — but read this : | |
<ul> | |
<li>FF can’t clip a basic shape like <<code>>clip-path: circle( 50%, 50%, 5em );</code>.<b>That’s bad.</b></li> | |
<li>But it can clip any <abbr title="HyperText Markup Language">HTML</abbr> element when referencing a <abbr title="Scalable Vector Graphics">SVG</abbr> <code>clipPath</code> element (watch my <abbr title="Document Object Model">DOM</abbr>). That’s pretty good.</li> | |
<li>Bad thing is : you have to specify dimensions. Percentage won’t work and you shall cry. Relative units like <code>em</code> will work, but behind FF 17, it becomes weird. <b>That’s a bad thing because you won’t be able to use it on a fluid layout.</b></li> | |
<li>Prior to version 4, FF will fallback to the ol’ good <abbr title="Cascadinc StyleSheet">CSS</abbr> 2.1 <code>clip</code> property. Which is good, but is restricted to rectangle shapes (as you may know).</li> | |
</ul> | |
</li> | |
<li><b>Opera 15 and up is just good.</b></li> | |
<li>Opera from 10.6 to 15 fallback to <abbr title="Cascadinc StyleSheet">CSS</abbr> 2.1 <code>clip</code> property. <b>Pretty good.</b></li> | |
<li><b>Let’s talk about IE.</b> Please sit up. | |
<ul> | |
<li>That just doesn’t work on IE 11 and lower. Surprised ? You should be ! IE9 to 11 can clip when referencing a <code>clipPath</code> element (just like Firefox, remember ?) but it can only clip inside a <abbr title="Scalable Vector Graphics">SVG</abbr> element. That means you could use <code>ForeignObject</code> to wrap your <abbr title="HyperText Markup Language">HTML</abbr> inside any <abbr title="Scalable Vector Graphics">SVG</abbr> and it should work ! More test to come…</li> | |
<li>IE8 will always fallback to <abbr title="Cascadinc StyleSheet">CSS</abbr> 2.1 <code>clip</code> property, but it’s very good ! In our test case, that means it only misses the circle thing — but that’s obvious and logical since it can’t draw a border-radius anyway. <b>Squares everywhere, yay !</b></li> | |
<li>IE7 just doesn’t do anything with pseudo-elements so it just do a good job.</li> | |
</ul> | |
</li> | |
</ol> | |
<h2>What you could do</h2> | |
<p>It’s pretty good when you can specify width and height.</p> | |
<p>But it maybe doable with other ressources :</p> | |
<ul> | |
<li><a href="http://www.w3.org/TR/css-masking-1/#masking"><code>mask-image</code></a> : since it’s now part of the specs, you may try. You can position it just like a background, and the Apple’s version is from 2008.</li> | |
<li>Pure SVG. Yeah, I know.</li> | |
<li>Javascript may help for each of these tricks…</li> | |
</ul> | |
</div> | |
<svg width="800" height="390"> | |
<defs> | |
<clipPath id="circle"> | |
<circle cx="50%" cy="50%" r="80" /> | |
</clipPath> | |
</defs> | |
</svg> |
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*, | |
:after, | |
:before { | |
-webkit-box-sizing: border-box; | |
-moz-box-sizing: border-box; | |
box-sizing: border-box; | |
} | |
section, | |
header, | |
footer { display: block; } | |
/* Références : | |
* http://codepen.io/iamvdo/pen/EIjLa | |
* http://codepen.io/iamvdo/pen/hasAm | |
* http://www.24joursdeweb.fr/2013/les-masques-css/ | |
* http://www.html5rocks.com/en/tutorials/masking/adobe/ | |
* http://docs.webplatform.org/wiki/css/properties/clip-path | |
* https://developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/Clipping_and_masking | |
* http://www.w3.org/TR/SVG/masking.html#ClippingPaths | |
* https://www.webkit.org/blog/181/css-masks/ | |
* https://developer.apple.com/library/safari/documentation/AppleApplications/Reference/SafariCSSRef/Articles/StandardCSSProperties.html#//apple_ref/doc/uid/TP30001266-VisualEffects | |
*/ | |
/** | |
* 1. Position is everything — and very useful to place the ::before pseudo-element :) | |
* 2. Giving background. | |
* 3. Used to position SVG shape used as a fallback for clip-path: <basic-shape>. | |
* 4. Useful for IE8. | |
*/ | |
.boxes { | |
list-style: none; | |
padding: 0; | |
margin: 2em auto 0; | |
overflow: hidden; | |
position: relative; /* 1 */ | |
background-image : url(http://lorempixel.com/output/nature-q-c-800-400-10.jpg); /* 2 */ | |
max-width: 800px; /* 3 */ | |
z-index: 1; /* 4 */ | |
} | |
/** | |
* @note : The trick is to create a pseudo-element with the exact same dimensions and background than the .boxes, and stack it above. Then we’ll clip it in order to make it a simple circle, creating a « see-hrough » like effect. | |
* 1. Creating ::before with the same dimensions as its relative parent (.boxes) | |
* 2. Giving the same background. | |
* 3. Using a simple rectangle clip for simplest browsers (a.k.a. IE). | |
* 4. Clipping the pseudo-element to create the centered circle. | |
* 5. SVG shape is more cross-browser. Circle is centered with <cx> and <cy> attributes : 400 = 800(.boxes’width)/2 and 12em = 6em(.box’s height + margin-bottom)*2. | |
*/ | |
.boxes:before { | |
content: ''; | |
position: absolute; /* 1 */ | |
z-index: 2; /* 1 */ | |
bottom: 0; /* 1 */ | |
right: 0; /* 1 */ | |
left: 0; /* 1 */ | |
top: 0; /* 1 */ | |
background-image: inherit; /* 2 */ | |
clip: rect( 7em, 30em, 17em, 20em ); /* 3 */ | |
-webkit-clip-path: circle( 50%, 50%, 5em ); /* 4 */ | |
clip-path: url(#circle); /* 5 */ | |
} | |
/** | |
* 1. Width and height are equal t get a square and 5em for proportions with other elements; | |
* 2. Making a circle; | |
* 3. Centering the circle. | |
*/ | |
.boxes:after { | |
content: ''; | |
position: absolute; | |
background: #34495e; | |
height: 5em; /* 1 */ | |
width: 5em; /* 1 */ | |
border: .5em solid #2f3e51; | |
border-radius: 50%; /* 2 */ | |
z-index: 3; | |
left: 44%; /* 3 */ | |
top: 40%; /* 3 */ | |
left: calc( 50% - 2.5em ); /* 3 */ | |
top: calc( 50% - 2.5em ); /* 3 */ | |
} | |
/** | |
* 1. Feel free to move to inline-block or whatever | |
* 2. Useful for IE8. | |
*/ | |
.box { | |
color: #fff; | |
float: left; /* 1 */ | |
margin: 1em; | |
position: relative; /* 2 */ | |
z-index: -1; /* 2 */ | |
width: 45%; /* 2 */ | |
width: calc( 50% - 2em ); | |
} | |
.box-header, | |
.box-footer { | |
min-height: 5em; | |
padding: 1em; | |
} | |
.box-alpha .box-header { background: #1abc9c; } | |
.box-alpha .box-footer { background: #148f77; } | |
.box-beta .box-header { background: #2ecc71; } | |
.box-beta .box-footer { background: #25a25a; } | |
.box-gamma .box-header { background: #217dbb; } | |
.box-gamma .box-footer { background: #3498db; } | |
.box-delta .box-header { background: #804399; } | |
.box-delta .box-footer { background: #9b59b6; } | |
/* Legend */ | |
.text { | |
margin: 2em auto; | |
max-width: 800px; | |
} |
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