IE11和Edge中的SVG / CSS3过渡问题

Question

我已在SVG的transition属性上使用stroke-dashoffset创建了以下径向擦拭：

此功能在IE11和MS Edge除外的所有主流浏览器中均能正常工作。我的项目需要同时支持这两种浏览器，CanIUse表示这两种浏览器均应支持我用来实现效果的这些声明。为什么IE11和MS Edge在忽略:hover属性上的:focus的情况下立即渲染transition和stroke-dashoffset上的蓝绿色环？

我的代码如下。请注意，background-image不会显示，因为它未在代码段中链接。

.avatar {
    position: relative;
    display: block;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    padding: 2px;
    padding: 0.125rem;
    border: 1px solid #c9c9c9;
    border: 0.0625rem solid #c9c9c9;
    border-radius: 100%;
}
.avatar--m {
    width: 40px;
    width: 2.5rem;
    height: 40px;
    height: 2.5rem;
}
.avatar__border {
    position: absolute;
    top: -1px;
    top: -0.0625rem;
    left: -1px;
    left: -0.0625rem;
}
.avatar--m > .avatar__border {
    width: 40px;
    width: 2.5rem;
    height: 40px;
    height: 2.5rem;
}
.avatar__border__stroke {
    -webkit-transform: rotate(-90deg);
    -ms-transform: rotate(-90deg);
    transform: rotate(-90deg);
    stroke: #11a0ad;
    stroke-width: 1;
    fill: none;
    -webkit-transition: stroke-dashoffset 500ms ease-in-out;
    -o-transition: stroke-dashoffset 500ms ease-in-out;
    transition: stroke-dashoffset 500ms ease-in-out;
}
.avatar--m .avatar__border__stroke {
    -webkit-transform-origin: 20px 20px;
    -ms-transform-origin: 20px 20px;
    transform-origin: 20px 20px;
    -webkit-transform-origin: 1.25rem 1.25rem;
    -ms-transform-origin: 1.25rem 1.25rem;
    transform-origin: 1.25rem 1.25rem;
    stroke-dasharray: 125.6636;
    stroke-dashoffset: 125.6636;
}
.avatar:hover .avatar__border__stroke {
    stroke-dashoffset: 0;
}
.avatar__image {
    width: 100%;
    height: 100%;
    border-radius: 100%;
}
.avatar__image--male-1 {
    background: url(/static/media/avatar__image--male-1.8982bdbc.svg), -webkit-linear-gradient(45deg, rgba(17, 160, 173, 0.13), rgba(33, 208, 217, 0.13)), white;
    background: url(/static/media/avatar__image--male-1.8982bdbc.svg), -o-linear-gradient(45deg, rgba(17, 160, 173, 0.13), rgba(33, 208, 217, 0.13)), white;
    background: url(/static/media/avatar__image--male-1.8982bdbc.svg), linear-gradient(45deg, rgba(17, 160, 173, 0.13), rgba(33, 208, 217, 0.13)), white;
    background-position: center bottom -1px, 0;
    background-position: center bottom -0.0625rem, 0;
    background-repeat: no-repeat, repeat;
    background-size: auto 85%, cover;
}

.badge {
    display: inline-block;
    min-width: 8px;
    min-width: 0.5rem;
    height: 24px;
    height: 1.5rem;
    padding: 0 8px;
    padding: 0 0.5rem;
    border-radius: 12px;
    border-radius: 0.75rem;
    background-color: rgba(0, 0, 0, 0.21);
    color: white;
    line-height: 24px;
    line-height: 1.5rem;
    font-size: 11px;
    font-size: 0.6875rem;
    font-weight: 700;
    text-align: center;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}
.badge--error {
    background-color: #ed4a4a;
}
.avatar--m > .badge {
    position: absolute;
    top: -8px;
    top: -0.5rem;
    left: 24px;
    left: 1.5rem;
    cursor: pointer;
}

<a class="avatar avatar--m avatar--error" href="https://www.example.com" title="Charlie Winchester">
  <svg class="avatar__border" viewBox="0 0 40 40">
    <circle class="avatar__border__stroke" cx="20" cy="20" r="19.5"></circle>
  </svg>
  <div class="avatar__image avatar__image--male-1"></div>
  <span class="badge badge--error" unselectable="on">1k+</span>
</a>