Exemple de code de la propriété CSS flex-direction.

<style>
.exemple-flex-direction-column { flex-direction : column; border-color:#2a712a; }
.exemple-flex-direction-row { flex-direction : row; border-color:#666; }

.exemple-direction-rtl{ direction : rtl; }
.exemple-writing-mode-lr { writing-mode : vertical-lr; }
.exemple-writing-mode-rl { writing-mode : vertical-rl; }

.exemple-flex-container { display : flex; width:400px; height:auto; }
.exemple { border-width:1px; border-style:solid; margin-bottom:10px; padding:5px; }
.exemple-flex-item { border:1px dotted #666; }
</style>

<div class="exemple exemple-flex-container exemple-flex-direction-column">
    <div class="exemple-flex-item">1 ) <b>flex-direction : column; </b> Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa.</div>
    <p class="exemple-flex-item">2 ) <b>flex-direction : column; </b> Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa.</p>
    <span class="exemple-flex-item">3 ) <b>flex-direction : column; </b> Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa.</span >
</div>

<div class="exemple exemple-flex-container exemple-flex-direction-column exemple-direction-rtl">
    <div class="exemple-flex-item">1 ) <b>flex-direction : column; <br> direction : rtl; </b></div>
    <p class="exemple-flex-item">2 ) <b>flex-direction : column; <br> direction : rtl; </b></p>
    <span class="exemple-flex-item">3 ) <b>flex-direction : column; <br> direction : rtl; </b></span>
</div>

<div class="exemple exemple-flex-container exemple-flex-direction-column exemple-writing-mode-lr">
    <div class="exemple-flex-item">1 ) <b>flex-direction : column; <br>writing-mode : vertical-lr; </b></div>
    <p class="exemple-flex-item">2 ) <b>flex-direction : column; <br>writing-mode : vertical-lr; </b></p>
    <span class="exemple-flex-item">3 ) <b>flex-direction : column; <br>writing-mode : vertical-lr; </b></span>
</div>

<div class="exemple exemple-flex-container exemple-flex-direction-column exemple-writing-mode-rl">
    <div class="exemple-flex-item">1 ) <b>flex-direction : column; <br>writing-mode : vertical-rl; </b></div>
    <p class="exemple-flex-item">2 ) <b>flex-direction : column; <br>writing-mode : vertical-rl; </b></p>
    <span class="exemple-flex-item">3 ) <b>flex-direction : column; <br>writing-mode : vertical-rl; </b></span>
</div>

<div class="exemple exemple-flex-container exemple-flex-direction-row">
    <div class="exemple-flex-item">1 ) <b>flex-direction : row; </b></div>
    <p class="exemple-flex-item">2 ) <b>flex-direction : row; </b></p>
    <span class="exemple-flex-item">3 ) <b>flex-direction : row; </b></span>
</div>

<div class="exemple exemple-flex-container exemple-flex-direction-row exemple-direction-rtl">
    <div class="exemple-flex-item">1 ) <b>flex-direction : row; direction : rtl; </b></div>
    <p class="exemple-flex-item">2 ) <b>flex-direction : row; direction : rtl; </b></p>
    <span class="exemple-flex-item">3 ) <b>flex-direction : row; direction : rtl; </b></span>
</div>

<div class="exemple exemple-flex-container exemple-flex-direction-row exemple-writing-mode-lr">
    <div class="exemple-flex-item">1 ) <b>flex-direction : row; <br>writing-mode : vertical-lr; </b></div>
    <p class="exemple-flex-item">2 ) <b>flex-direction : row; <br>writing-mode : vertical-lr; </b></p>
    <span class="exemple-flex-item">3 ) <b>flex-direction : row; <br>writing-mode : vertical-lr; </b></span>
</div>

<div class="exemple exemple-flex-container exemple-flex-direction-row exemple-writing-mode-rl">
    <div class="exemple-flex-item">1 ) <b>flex-direction : row; <br>writing-mode : vertical-rl; </b></div>
    <p class="exemple-flex-item">2 ) <b>flex-direction : row; <br>writing-mode : vertical-rl; </b></p>
    <span class="exemple-flex-item">3 ) <b>flex-direction : row; <br>writing-mode : vertical-rl; </b></span>
</div>