animation CSS machine à écrire ٩◔̯◔۶

<style><!--
@-webkit-keyframes typing {
from { width: 0 }
to { width:50% }
}

@-moz-keyframes typing {
from { width: 0 }
to { width:50% }
}

@-webkit-keyframes blink-caret {
from, to { border-color: transparent }
50% { border-color: black}
}

@-moz-keyframes blink-caret {
from, to { border-color: transparent }
50% { border-color: black }
}

#machine { font-family: Consolas, monospace; }

.machinebox {
font-size:150%;
width:50%;
white-space:nowrap;
overflow:hidden;
border-right: .1em solid red;

-webkit-animation: typing 17s steps(33, end), /*  steps =nbre de caracteres et espaces */
blink-caret 1s step-end infinite;
-moz-animation: typing 17s steps(33, end), 
blink-caret 1s step-end infinite;
}
--></style>
<div id="machine" class="machinebox">Bonjour et bienvenue sur ce blog..</div>