Edit in JSFiddle

$('#content').resizable();

<div id="content">
    <div id="float">
        <h4>Floating blocks:</h4>
        <div>1</div>
        <div>2</div>
        <div>3</div>
        <div>4</div>
        <div>5</div>
        <div>6</div>
    </div>
    <div id="inline">
        <h4>Inline blocks:</h4>
        <div>1</div>
        <div>2</div>
        <div>3</div>
        <div>4</div>
        <div>5</div>
        <div>6</div>
    </div>
</div>
<div id="tip">←虛線可拖曳縮放</div>

#inline > div {
    display: inline-block;
    width: 78px;
    height: 78px;
    background: #FFFFAA;
    border: 1px dotted gray;
    font-size: 32px;
    text-align: center;
    vertical-align: middle;
    line-height: 78px;
}

#float > div {
    float: right;    
    width: 78px;
    height: 78px;
    background: #FFAAFF;
    border: 1px dotted gray;
    font-size: 32px;
    text-align: center;
    vertical-align: middle;
    line-height: 78px;
}

#float:after {
    display: block;
    visibility: hidden;
    height: 0;
    clear: both;
    content: ".";
}


#inline, #float {
    display: block;
    /* display: inline-block; */
    width: 100%;
}
#inline h4, #float h4{
    font-size: 14px;
    margin-top: 0;
}
#inline {
    background: #CCCCFF;
    text-align: right;
}

#float {
    background: #CCFFCC;
}

#content {
    font-size: 0;
    display: inline-block;
    max-width: 400px;
    width: 100%;
    height: auto;
    border: 1px dotted gray;
}

#tip {
    display: inline-block;
    vertical-align: top;    
}