    .#{$prefix}fieldset {
        display: block; /* preserve margins in IE */
        position: relative;
    }

    .#{$prefix}fieldset-header {
        overflow: hidden; // fixes a webkit bug where legend elements that have floated children are not displayed

        .#{$prefix}form-item,
        .#{$prefix}tool {
            float: left;
        }

        .#{$prefix}fieldset-header-text {
            float: left;
        }

        .#{$prefix}form-cb-wrap {
            font-size: 0;
            line-height: 0;
            height: auto; // override form-cb-wrap's height from neutral theme
        }

        .#{$prefix}form-cb {
            margin: 0; // override the default checkbox margin
            position: static; // Checkboxes are now absolutely positioned so reset the positioning (see EXTJSIV-10302).
        }
    }

    @if $include-rtl {
        .#{$prefix}rtl.#{$prefix}fieldset-header {
            .#{$prefix}form-item,
            .#{$prefix}tool {
                float: right;
            }

            .#{$prefix}fieldset-header-text {
                float: right;
            }
        }
    }