Curs Css


CSS3 contine trei noi proprietati pentru background: background-size, background-origin si background-clip, in plus, se pot adauga mai multe imagini pt. background la un element HTML si se pot crea culori gradient cu: linear-gradient.


background-size

Proprietatea CSS background-size: width height; permite definirea lungimii si inaltimii (width height) de afisare a imaginii pt. background.

- Valori:

- Exemplu:
<style>
#id1 {
 width:200px;
 height:100px;
 border:1px solid blue;
 background:url('css/css3.jpg');
 background-size:100px 60px;
 background-repeat:no-repeat;
 margin:5px auto;
}
#id2 {
 width:300px;
 height:120px;
 border:1px solid #01da02;
 background:url('css/css3.jpg');
 background-size:contain;
 background-repeat:no-repeat;
 margin:5px auto;
}
#id3 {
 width:300px;
 height:120px;
 border:1px solid silver;
 background:url('css/css3.jpg');
 background-size:cover;
 margin:5px auto;
}
</style>

<div id="id1">Free CSS Course - size in pixels</div>
<div id="id2">coursesweb.net - size contain</div>
<div id="id3">marplo.net - size cover</div>
Rezultat:
css3 tutorial
Free CSS Course - size in pixels
css course
coursesweb.net - size contain
marplo.net - size cover

Culori Gradient

Pentru adaugare culoare gradient la fundal, se foloseste proprietatea background: linear-gradient(); cu aceasta sintaxa:
background: linear-gradient(direction, color-stop1, color-stop2, ...);
- "direction" reprezinta directia de afisarie a culorilor: "to right", "to bottom right", "top left", "top bottom" (default). Daca nu e specificata, se considera "top bottom".
- "color-stop" sunt culorile de referinta pt. gradient.

Exemplu:
<style>
#id1 {
background: linear-gradient(to bottom right, #11ee22, #fefe88, #1122fb);
height:120px;
width:300px;
}
</style>

<div id="id1">Free CSS Course<br />
coursesweb.net</div>
Rezultat:
Free CSS Course
coursesweb.net

Se poate defini si distanta de referinta a culorilor din gradient, adaugand un procent dupa valoarea culorii.
- Exemplu:
<style>
#id1 {
background: linear-gradient(to bottom right, #11ee22 0%, #fefe88 40%, #1122fb 75%);
height:120px;
width:300px;
}
</style>

<div id="id1">Free CSS Course<br />
coursesweb.net</div>

background-origin

Proprietatea CSS background-origin specifica zona de pozitionare a imaginii de fundal.
Preia una din aceste valori:
- Exemplu:
<style>
#id1 {
width:350px;
height:120px;
padding:20px;
border:3px solid blue;
background:url('css/css3.jpg');
background-repeat:no-repeat;
background-color:#bcfede;
background-origin:content-box;
}
#id2 {
width:350px;
height:120px;
padding:20px;
border:3px solid blue;
background:url('css/css3.jpg');
background-repeat:no-repeat;
background-color:#bcfede;
background-origin:border-box;
margin-top:5px;
}
</style>

<div id="id1">Position the background image within the content-box</div>
<div id="id2">Position the background image relative to the border</div>
Rezultat:
Position the background image within the content-box
Position the background image relative to the border

background-clip

Proprietatea background-clip se foloseste pentru a determina suprafata de afisare a culorii pentru fundal ( background-color ).
Preia una din aceste valori:
Exemplu:
<style>
#id1 {
 width:350px;
 height:120px;
 padding:20px;
 border:2px solid blue;
 background-color:#cdfeda;
 background-clip:padding-box;
}
#id2 {
 width:350px;
 height:120px;
 padding:20px;
 border:2px solid blue;
 background-color:#cdfeda;
 background-clip:content-box;
}
</style>

<div id="id1">background-clip with padding-box</div>
<div id="id2">background-clip with content-box</div>
Rezultat:
background-clip with padding-box
background-clip with content-box

Imagini Multiple la Background

Ca sa aplicati mai multe imagini la fundalul unui element HTML, se adauga la proprietatea css background-image functii url() (separate prin virgula) cu adresele imaginilor.
- Celelalte proprietati legate de "background-image" (background-position, background-repeat) folosesc valori separate prin virgula, in functie de modul dorit de afisare a imaginilor adaugate. Sau o singura valoare care se aplica la toate.

- Exemplu:
<style>
#id1 {
 width:400px;
 height:150px;
 background-image: url('css/html_course.jpg'), url('css/css3.jpg');
 background-repeat: no-repeat, repeat-x;
 background-position: center top, center bottom;
}
</style>

<div id="id1">Multiple background images</div>
Rezultat:
Multiple background images

Un Test simplu in fiecare zi

HTML
CSS
JavaScript
PHP-MySQL
Engleza
Spaniola
Ce atribut e folosit in tag-ul <img> pentru adresa imaginii?
href src rel
<img src="http://coursesweb.net/imgs/webcourses.gif" width="191" height="63" alt="Courses-Web" />
Care din aceste coduri CSS ascunde elementul in pagina?
display: none; display: inline; position: relative;
#id {
  display: none;
}
Ce instructiune opreste executia lui while() sau for() ?
continue prompt() break
for(var i = 0; i< 8; i++) {
  if(i > 1) break;
  alert(i);
}
Indicati functia utilizata pentru a crea constante.
define() include() defined()
define("CONSTANT_NAME", "value");
echo CONSTANT_NAME;
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classes clases clasis
This school has three classes.
- Scoala asta are trei clase.
Care este pluralul substativului "voz" (voce)?
vose voze voces
Escuché dos voces.
- Am auzit doua voci.
CSS3 - Background proprietati noi

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