Hi @Ranga_Tolapi the above enhancement request was added to the Calcite 1.4.0 release earlier this year on May 25, and is available from 1.4.0 to our current version released earlier today (1.10.0).
Below is an example implementation, which adds the "closable" attribute to the Tab Title component:
<calcite-tabs>
<calcite-tab-nav slot="title-group">
<calcite-tab-title selected closable>
Watercraft
</calcite-tab-title>
<calcite-tab-title closable>Automobiles</calcite-tab-title>
<calcite-tab-title closable>Aircrafts</calcite-tab-title>
</calcite-tab-nav>
<calcite-tab selected>
<calcite-notice icon="embark" open>
<div slot="message">Recommended for coastal use</div>
</calcite-notice>
</calcite-tab>
<calcite-tab>
<calcite-notice icon="car" open>
<div slot="message">A good choice for inland adventure</div>
</calcite-notice>
</calcite-tab>
<calcite-tab>
<calcite-notice icon="plane" open>
<div slot="message">Cross continents quickly</div>
</calcite-notice>
</calcite-tab>
</calcite-tabs>