Los que tengais la flechaIr arriba construida de esta manera, podeis hacer una prueba cambiando el ancho de vuestra ventana. Este es el código tipo con el que ocurre esto y el siguiente es con el que se ha construido elDIV con fondo rojo que podeis ver arriba a la derecha. Con él también podeis comprobar lo que comentábamos antes:
Con el primer código, la imagen estará SIEMPRE a 10px del borde derecho de la ventana y con el segundo, elDIV SIEMPRE estará a 200px. Con elTOP no tenemos este inconveniente porque el borde superior siempre está en el mismo sitio: arriba (perogrullada necesaria).
Para solucionar este desplazamiento horizontal, podemos utilizar un sencillo truco que consiste en cambiar la posición horizontal absoluta (LEFT,RIGHT), por un valor en porcentaje y, en concreto, por el valor50%. Esto hace que el elemento se situe hacia la mitad de la página en cualquier resolución. Una vez allí, sólo tenemos que aplicar un margen a derecha o a izquierda, según el caso, y con ello conseguimos desplazarlo del centro hasta donde nos convenga. Tomar como referencia el centro es la clave para que no se nos "mueva" elDIV.
La flecha que ahora mismo hay en la parte inferior derecha está construida con este sistema. Quizás sea más fácil entender la diferencia, observando el comportamiento delDIV rojo y de la flecha, al ir estrechando poco a poco la ventana de vuestro navegador.
Cosas a tener en cuenta...

En el gráfico podeis observar a modo de resumen el comportamiento de diversas combinacionesLEFT/RIGHT,MARGIN-LEFT/MARGIN-RIGHT.
ConLEFT:50% y sin margen, el vértice superior izquierdo delDIV se sitúa a partir de la mitad de la ventana. Sin embargo, el mismo caso conRIGHT:50% lo que hace es posicionar la esquina superior derecha en el centro.
En los cuadros claros de la segunda fila, utilizamosLEFT:50% con unMARGIN-LEFT:120PX y efectivamente, el intérprete nos deja ese margen por la izquierda, contando desde el centro. En este caso, unMARGIN-RIGHT no producirá ningún desplazamiento. Si partimos de unRIGHT:50%, el resultado será justo al contrario.
El cuadro claro que se encuentra en último lugar, refleja la posición que adoptaría un elemento posicionado conLEFT:50% y con unMARGIN-LEFT negativo. Este es un efecto bastante interesante para según qué cosas...
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