tasks.css

/*
 * The simplest possible CSS to present the default statuses provided by the
 * tasks plugin:
 *   [-]  Cancelled
 *   [/]  In Progress
 *
 * Should display the same in reading mode, editing mode and task display mode
 *
 * Thanks to deathau's checkbox snippets as a starting point:
 * https://github.com/deathau/obsidian-snippets/blob/main/checkbox.css
 *
 * Tested with Obsidian v1.5.3 and Tasks 6.0.0
 */

/* Horizontal dash icon in checkbox for Cancelled tasks */
.task-list-item-checkbox[data-task="-"]:checked::after,
.plugin-tasks-list-item[data-task="-"]>.task-list-item-checkbox:checked::after {
    content: '';
    background-color: white;
    margin: 0;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 14 14' xmlns='http://www.w3.org/2000/svg'%3E%3Crect x='0.5' y='6.5' width='13' height='1'/%3E%3C/svg%3E");
}

/* Strikethrough for Cancelled tasks */
.HyperMD-task-line[data-task="-"],
.plugin-tasks-list-item[data-task="-"] {
    text-decoration: var(--checklist-done-decoration);
}

/* Half shaded checkbox for In Progress tasks */
.task-list-item-checkbox[data-task="/"]:checked::after,
.plugin-tasks-list-item[data-task="/"]>.task-list-item-checkbox:checked::after {
    background-color: white;
    margin: 0;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 14 14' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolygon points='14,14 0,14 14,0'/%3E%3C/svg%3E");

}