Pero vamos a explicar un par de truquillos usando CSS que no sólo nos facilitan bastante la tarea, sino que también nos permitirán volver atrás cuando queramos, borrando sólo una única línea. La misma que ahora vamos a insertar en nuestro código para arreglar esto.
Laprimera opción es aplicar un fondo con el dibujo que queremos y que se aplicará en todos los casos. El truco está en que cuando existe avatar, este se mostrará por encima del fondo y no se apreciará que hay otra imagen debajo. Estamos hablando de CSS, así que esto habría que meterlo entre las dos etiquetasSKIN.
background: url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjy6qhHswzL34epfBPs3w2jZfz0yoc-EOQfwIO9VW6PwrAVm4STZuPtCMoeztjw0jTm1IAiHHeX4F8-VQtsfc7o-wkLcWViaVwtWcjIyJOYEEwQIVt8dSX8kUeWJO8f9masT6Vy17ZlQ4U/s1600/anonimo.jpg) no-repeat 50% 50%;
}
Este sistema sólo tiene un problema y es cuando el usuario utiliza una imagen con transparencia. En este caso, el avatar que usamos de fondo se verá a través de las zonas transparentes.
Segunda opción. Para solucionar eso echaremos mano de losselectores de atributos, que nos permiten filtrar dentro de una determinada clase, aquellos elementos con un característica peculiar.
Y esta característica en los comentarios anónimos es precisamente la imagen sin contenido que Blogger les aplica y cuya dirección eshttp://img1.blogblog.com/img/blank.gif. Si pincháis en el enlace veréis... nada, pues eso es lo que contiene la imagen. Bueno, en honor a la verdad es una imagen casi imperceptible de 1x1 px.
Teniendo en cuenta esto, la otra alternativa a mi parecer más completa, sería esta:
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjy6qhHswzL34epfBPs3w2jZfz0yoc-EOQfwIO9VW6PwrAVm4STZuPtCMoeztjw0jTm1IAiHHeX4F8-VQtsfc7o-wkLcWViaVwtWcjIyJOYEEwQIVt8dSX8kUeWJO8f9masT6Vy17ZlQ4U/s1600/anonimo.jpg) no-repeat 50% 50%;
}
Para los curiosos, lo que hace esto es buscar en todas las clases.avatar-image-container que haya en nuestra página y comprobar si la imagen que incluyen termina en la cadenaimg1.blogblog.com/img/blank.gif.
A las que cumplen con esa condición se les aplica un fondo que es el dibujo de nuestro anónimo amigo.
En este segundo sistema, el problema reside en que los navegadores más antiguos no reconocen los selectores de este tipo, pero afortunadamente, cada vez quedan menos.
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