Composant select déroulable avec vue js depuis un exemple en js

Voici la solution qui m'a finalement été apportée ailleurs, a tester pour les intéressés:
Code:
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<script>
import HelloWorld from "./components/HelloWorld.vue";
import { defineComponent } from "vue";
 
export default defineComponent({
  components: {
    HelloWorld,
  },
  data() {
    return {
      size: 1,
    };
  },
  methods: {
    onFocus: function () {
      this.size = 3;
    },
    onBlur: function () {
      this.size = 1;
    },
    onChange: function (event) {
      this.size = 1;
      event.target.blur();
    },
  },
});
</script>
 
<template>
  <img alt="Vue logo" src="./assets/logo.png" />
  <HelloWorld msg="Hello Vue 3 + Vite" />
  <p>Version HTML</p>
  <select
    class="html-version"
    onfocus="this.size=3;"
    onblur="this.size=1;"
    onchange="this.size=1; this.blur();"
  >
    <option>1</option>
    <option>2</option>
    <option>3</option>
    <option>4</option>
    <option>5</option>
    <option>6</option>
    <option>7</option>
    <option>8</option>
    <option>9</option>
    <option>10</option>
    <option>11</option>
    <option>12</option>
    <option>13</option>
    <option>14</option>
    <option>15</option>
    <option>16</option>
    <option>17</option>
    <option>18</option>
    <option>19</option>
    <option>20</option>
  </select>
  <p>Version Vue</p>
  <select
    class="vue-size-version"
    :size="size"
    @focus="onFocus"
    @blur="onBlur"
    @change="onChange"
  >
    <option>1</option>
    <option>2</option>
    <option>3</option>
    <option>4</option>
    <option>5</option>
    <option>6</option>
    <option>7</option>
    <option>8</option>
    <option>9</option>
    <option>10</option>
    <option>11</option>
    <option>12</option>
    <option>13</option>
    <option>14</option>
    <option>15</option>
    <option>16</option>
    <option>17</option>
    <option>18</option>
    <option>19</option>
    <option>20</option>
  </select>
</template>
 
<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>