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Servicii de dezvoltare web cu CSS, HTML și DHTML pentru site-uri rapide și responsive

Creare foilor de tip cascada

Prin utilizarea CSS aspectul documentului per ansamblu, sau a unui element individual din interiorul sau, poate fi ontrolat mult mai usor.Stilurile pot fi aplicate asupra unui element, asupra unui document, sau chiar asupra unui intreg site web. Exista insa dezavantajul ca unele navigatoare nu sunt compatibile CSS, astfel ca documentele HTML sunt afisate ca si cum CSS n-ar exista.
Stilurile pot fi specificate:

Adaugarea unui stil la o eticheta HTML

CSS ofera posibilitatea de a schimba aspectul fiecarei etichete in parte, prin stabilirea unui anume stil. Adaugarea este utila mai ales in scopul de a anula alte stiluri pentru elementul respectiv sau de a aduce noi elemente de stil etichetei respective. Sintaxa pentru definirea stilurilor in interiorul unei etichete HTML este urmatoarea:

				
					<eticheta style="proprietate:valoare;"> ... text ... </eticheta>

Este bine ca pentru delimitarea listei de definitii sa se foloseasca ghilimele duble (”), iar pentru valori in cadrul listei, ghilimele simple (’).

				
					<h1 style="color:blue;">Antet personalizat</h1>

CSS adaugat direct in pagina HTML

CSS permite definirea unor reguli aplicabile intr-un document. Acest set de reguli apare in sectiunea de antet (head) a documentului, fiind delimitate cu ajutorul etichetei STYLE, care se comporta ca un container. Sintaxa pentru definirea CSS la nivel de document HTML este urmatoarea:

				
					<style type="text/css">selector_1 {proprietate1:valoare1; proprietate2:valoare2; ...}
...
selector_n {proprietate1:valoare1; proprietate2:valoare2; ...}</style>

				
					<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>HTML cu CSS definit intern</title><style type="text/css">h1{
 color: red;
}</style></head>
<body>
<h1>Adaugarea unui stil la o eticheta HTML</h1>
<h2>Heading 2 - format implicit.</h2>
<h2 style="color: blue;">Heading 2 formatat cu ajutorul CSS.</h2> <script data-no-optimize="1">!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).LazyLoad=e()}(this,function(){"use strict";function e(){return(e=Object.assign||function(t){for(var e=1;e<arguments.length;e++){var n,a=arguments[e];for(n in a)Object.prototype.hasOwnProperty.call(a,n)&&(t[n]=a[n])}return t}).apply(this,arguments)}function i(t){return e({},it,t)}function o(t,e){var n,a="LazyLoad::Initialized",i=new t(e);try{n=new CustomEvent(a,{detail:{instance:i}})}catch(t){(n=document.createEvent("CustomEvent")).initCustomEvent(a,!1,!1,{instance:i})}window.dispatchEvent(n)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,bt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,bt,e)}function r(t){return s(t,null),0}function u(t){return null===c(t)}function d(t){return c(t)===vt}function f(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function _(t,e){nt?t.classList.add(e):t.className+=(t.className?" 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</html>

Definirea tuturor stilurilor intr-o locatie comuna faciliteaza modificarea mai rapida a unui document.

				
					<style type="text/css">h1 {font-family: ’Arial’; font-size: 16px; font-weight: bold; color: red;}
p {font-family: ’Arial’; font-size: 12px; color: blue;}</style>

Este bine sa se utilizeze etichetele de comentariu HTML pentru a ascunde codul CSS de navigatoarele care nu recunosc acest limbaj, altfel va fi afisat in fereastra definirea foilor de stil in format text.

				
					<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>HTML cu CSS definit intern</title><style type="text/css">h1{
color: red;
}</style></head>
<body>
<h1>Adaugarea unui stil la o eticheta HTML</h1>
<h2>Heading 2 - format implicit.</h2>
<h2 style="color: blue;">Heading 2 formatat cu ajutorul CSS.</h2> <script data-no-optimize="1">!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).LazyLoad=e()}(this,function(){"use strict";function e(){return(e=Object.assign||function(t){for(var e=1;e<arguments.length;e++){var n,a=arguments[e];for(n in a)Object.prototype.hasOwnProperty.call(a,n)&&(t[n]=a[n])}return t}).apply(this,arguments)}function i(t){return e({},it,t)}function o(t,e){var n,a="LazyLoad::Initialized",i=new t(e);try{n=new CustomEvent(a,{detail:{instance:i}})}catch(t){(n=document.createEvent("CustomEvent")).initCustomEvent(a,!1,!1,{instance:i})}window.dispatchEvent(n)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,bt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,bt,e)}function r(t){return s(t,null),0}function u(t){return null===c(t)}function d(t){return c(t)===vt}function f(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function _(t,e){nt?t.classList.add(e):t.className+=(t.className?" 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