Tips HTML y CSS

Tips HTML y CSS.md

Recursos HTML

Recursos para la resolución de problemas HTML

Para cualquier tag

Posicionamiento

Centrado horizontal (mediante margin)

Debe tener width especificado

.div{
    width: 50%
    margin: 0 auto;
}

Centrado vertical (mediante inline-block)

Source: http://jsfiddle.net/kizu/4RPFa/4570/

<div class="container">
    <div class="wrap"></div>
    <img src="http://lorempixel.com/100/100">
</div>

.container {
    text-align: center;
}

.container .wrap {
    display: inline-block;
    vertical-align: middle;
    
    height: 100%;
}

.container img {
    display: inline-block;
    vertical-align: middle;
}

Posicionar a la izquierda (de manera relativa mediante margin)

.div{
    margin-left:auto;
    margin-right:0;
}

No seleccionable

#mydiv{
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: -moz-none;
}

Para formularios

Eliminar borde en input y textarea añadido por navegadores

input, select, textarea{
  outline: 0;
}

Añadiendo placeholder a select

Source: https://shellzero.wordpress.com/2015/06/29/adding-a-placeholder-to-the-select-tag-in-html5/

<select name=”browsers” required>
  <option value=”” disabled selected>Choose a Browser</option>
  <option value=”chrome”>CHROME</option>
  <option value=”safari”>SAFARI</option>
  <option value=”opera”>OPERA</option>
</select>

option[value=””][disabled] {
  display: none;
}

Personalizar input[type='file']

Source: http://tympanus.net/codrops/2015/09/15/styling-customizing-file-inputs-smart-way/ Source: http://jsfiddle.net/angelfcm/nETSD/light/

Botón personalizado

<div id='div-file'>
    <input type='file' id='input-file'>
    <span id='span-file'>Seleccionar fichero</span>
</div>

#div-file{
    overflow: hidden;
    position: relative;
    cursor: pointer;
    width: 200px;
    height: 100px;
    background-color: blue;
}
#input-file{
    margin: 0;
    padding: 0;
    outline: 0;
    font-size: 10000px;
    border: 10000px solid transparent;
    opacity: 0;
    filter: alpha(opacity=0);
    position: absolute;
    right: -1000px;
    top: -1000px;
    cursor: pointer;
}

Mostrar el nombre de archivo

$("#input-file").change(function () {
    $("#span-file").text($(this).val().match(/[^\/\\]+$/));
});

Personalizar input[type='checkbox']

<input type="checkbox" id="mycheckbox">

#mycheckbox {
  visibility: hidden;
  width: 30px;
  height: 30px;
}

#mycheckbox:after {
    content: " ";
    
    width: 100%;
    height: 100%;
    visibility: visible;
    cursor: pointer;
    display: inline-block;

    background-color: white;
    border: red solid 2px;
}

#mycheckbox:checked:after {
    content: "\2714";
    font-size: 23px;
    text-align: center;
}

Personalizar flecha de select

<div id="myselect">
    <select>
        <option value="1">1</option>
    </select>
</div>

#myselect{
    position: relative;
    height: 50px;
    width: 150px;
}
#myselect > select{
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    
    height: 100%;
    width: 100%;
}
#myselect:after{
    position: absolute;
    top: 0;
    right: 5%;
    
    height: 100%;
    width: 10%;
    
    background-image: url(arrow.png);
    background-size: 100%;
    background-position: 50%;
    background-repeat: no-repeat;
}

Sobre CSS

inline-block

Eliminar espaciados horizontales

https://ksesocss.blogspot.com/2012/03/display-inline-block-y-sus-empeno-en.html