Still broken in 4.10 for IE. The span inside Locator div should have class='esri-icon esri-icon-locate', but it has only class='esri-icon'. I solved it with CSS .esri-locate .esri-icon:before {
content: "\e630";
}
.esri-locate .esri-icon-loading-indicator:before {
content: "\e65e";
}
.esri-locate .esri-icon {
font-family: 'CalciteWebCoreIcons' !important;
speak: none;
font-style: normal;
font-weight: normal;
font-variant: normal;
text-transform: none;
line-height: 1;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
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