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Composition des e-mails HTML et complexités Outlook
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Images de fond
Images d'arrière-plan de cellule de tableau pleine largeur
<html xmlns:v="urn:schemas-microsoft-com:vml">
<head>
<style>
v:* { behavior: url(#default#VML); display: inline-block; }
</style>
</head>
<body>
<center>
<table width="100%" height="20">
<tr>
<td bgcolor="#dddddd" style="background-image:url('http://placekitten.com/g/500/300');background-repeat:no-repeat;background-position:center;" background="http://placekitten.com/g/500/300" width="100%" height="300">
<!--[if gte mso 9]>
<v:rect xmlns:v="urn:schemas-microsoft-com:vml" fill="true" stroke="false" style="mso-width-percent:1000;height:300px;">
<v:fill type="frame" src="http://placekitten.com/g/500/300" color="#ffffff" />
</v:rect>
<![endif]-->
</td>
</tr>
<tr>
<td bgcolor="#33cc99">
<table border="0" cellpadding="5" cellspacing="0"><tr><td height="5"><table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr></table></td></tr></table>
</td>
</tr>
<tr>
<td bgcolor="#ffff99" style="background-image:url('http://placekitten.com/g/500/300');background-repeat:no-repeat;background-position:center;" background="http://placekitten.com/g/500/300" width="100%" height="300">
<!--[if gte mso 9]>
<v:rect xmlns:v="urn:schemas-microsoft-com:vml" fill="true" stroke="false" style="mso-width-percent:1000;height:300px;">
<v:fill type="frame" src="http://placekitten.com/g/500/300" color="#ffffff" />
</v:rect>
<![endif]-->
</td>
</tr>
</table>
</center>
</body>
</html>
- Testé dans Outlook 2010 via Windows 7 VMWare sur OSX 10.9.2

Images d'arrière-plan de cellule de tableau pleine largeur en mosaïque
<html xmlns:v="urn:schemas-microsoft-com:vml">
<head>
<style>
v:* { behavior: url(#default#VML); display: inline-block; }
</style>
</head>
<body>
<center>
<table width="100%">
<tr>
<td bgcolor="#dddddd" style="background-image:url('http://placekitten.com/g/500/300');background-repeat:no-repeat;background-position:center;" background="http://placekitten.com/g/500/300" width="100%" height="300">
<!--[if gte mso 9]>
<v:rect xmlns:v="urn:schemas-microsoft-com:vml" fill="true" stroke="false" style="mso-width-percent:1000;height:300px;">
<v:fill type="tile" src="http://placekitten.com/g/500/300" color="#ffffff" />
</v:rect>
<![endif]-->
</td>
</tr>
</table>
</center>
</body>
</html>
- Testé dans Outlook 2010 via Windows 7 VMWare sur OSX 10.9.2

Images d'arrière-plan de cellule de tableau de largeur spécifiées
Voici un exemple, deux lignes, la première ligne comporte 3 colonnes avec 3 images d'arrière-plan distinctes, la deuxième ligne s'étend sur une image d'arrière-plan.
<table width="600" border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse;">
<tr>
<td style="width: 300px; height: 80px; background-image: url('http://placekitten.com/g/300/80');">
<!--[if gte mso 9]>
<v:image xmlns:v="urn:schemas-microsoft-com:vml" id="theImage" style='behavior: url(#default#VML); display: inline-block; position: absolute; width: 300px; height: 80px; top: 0; left: 0; border: 0; z-index: 1;' src="http://placekitten.com/g/300/80" />
<v:shape xmlns:v="urn:schemas-microsoft-com:vml" id="theText" style='behavior: url(#default#VML); display: inline-block; position: absolute; width: 300px; height: 80px; top: -5; left: -10; border: 0; z-index: 2;'>
<div>
<![endif]-->
<table width="300" border="0" cellspacing="0" cellpadding="0" style="border-collapse: collapse;">
<tr>
<td height="80" align="center" valign="top" style="color:#ffffff;font-size:20px;">
<span>Text</span>
</td>
</tr>
</table>
<!--[if gte mso 9]>
</div>
</v:shape>
<![endif]-->
</td>
<td style="width: 100px; height: 80px; background-image: url('http://placekitten.com/g/100/80');">
<!--[if gte mso 9]>
<v:image xmlns:v="urn:schemas-microsoft-com:vml" id="theImage" style='behavior: url(#default#VML); display: inline-block; position: absolute; width: 100px; height: 80px; top: 0; left: 0; border: 0; z-index: 1;' src="http://placekitten.com/g/100/80" />
<v:shape xmlns:v="urn:schemas-microsoft-com:vml" id="theText" style='behavior: url(#default#VML); display: inline-block; position: absolute; width: 100px; height: 80px; top: -5; left: -10; border: 0; z-index: 2;'>
<div>
<![endif]-->
<table width="80" border="0" cellspacing="0" cellpadding="0" style="border-collapse: collapse;">
<tr>
<td height="80" align="center" valign="top">
<span>Text</span>
</td>
</tr>
</table>
<!--[if gte mso 9]>
</div>
</v:shape>
<![endif]-->
</td>
<td style="width: 200px; height: 80px; background-image: url('http://placekitten.com/g/200/100');">
<!--[if gte mso 9]>
<v:image xmlns:v="urn:schemas-microsoft-com:vml" id="theImage" style='behavior: url(#default#VML); display: inline-block; position: absolute; width: 200px; height: 80px; top: 0; left: 0; border: 0; z-index: 1;' src="http://placekitten.com/g/200/100" />
<v:shape xmlns:v="urn:schemas-microsoft-com:vml" id="theText" style='behavior: url(#default#VML); display: inline-block; position: absolute; width: 200px; height: 80px; top: -5; left: -10; border: 0; z-index: 2;'>
<div>
<![endif]-->
<table width="200" border="0" cellspacing="0" cellpadding="0" style="border-collapse: collapse;">
<tr>
<td height="80" align="center" valign="top" style="color:#ffffff;font-size:20px;">
<span>Text</span>
</td>
</tr>
</table>
<!--[if gte mso 9]>
</div>
</v:shape>
<![endif]-->
</td>
</tr>
</table>
<table width="600" border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse;">
<tr>
<td style="width: 600px; height: 150px; background-image: url('http://placekitten.com/g/600/150');">
<!--[if gte mso 9]>
<v:image xmlns:v="urn:schemas-microsoft-com:vml" id="theImage" style='behavior: url(#default#VML); display: inline-block; position: absolute; width: 600px; height: 150px; top: 0; left: 0; border: 0; z-index: 1;' src="http://placekitten.com/g/600/150" />
<v:shape xmlns:v="urn:schemas-microsoft-com:vml" id="theText" style='behavior: url(#default#VML); display: inline-block; position: absolute; width: 600px; height: 150px; top: -5; left: -10; border: 0; z-index: 2;'>
<div>
<![endif]-->
<table width="600" border="0" cellspacing="0" cellpadding="0" style="border-collapse: collapse;">
<tr>
<td height="150" align="center" valign="top" style="color:#ffffff;font-size:20px;">
<span>Text</span>
</td>
</tr>
</table>
<!--[if gte mso 9]>
</div>
</v:shape>
<![endif]-->
</td>
</tr>
</table>
- Testé dans Outlook 2010 via Windows 7 VMWare sur OSX 10.9.2

Création d'espaceurs
Certains clients de messagerie (notamment Windows Desktop Outlook) réduisent les tables sans contenu, même s'il existe des dimensions ou un remplissage.
Pour empêcher ces clients de réduire la table d'espacement, vous pouvez ajouter un invisible qui sert de contenu. Ensuite, mettez à zéro la font-size de font-size et la line-height afin de ne pas affecter les dimensions de la <table> . L'attribut height (ou width) est désormais la seule chose qui affecte les dimensions de l'espaceur.
<table border="0" cellpadding="0" cellspacing="0" role="presentation">
<tr>
<td height="40" style="font-size: 0; line-height: 0;">
</td>
</tr>
</table>
Il était courant d'utiliser un fichier .gif transparent 1x1 en tant qu'espaceur, mais cette méthode est obsolète.