tabi-test/sass/parts/_spoiler.scss

.spoiler-toggle {
    display: none; // Hide the checkbox.
}

.spoiler-content {
    display: inline-block; // Allow content to only take up its own width.
    cursor: help; // Indicate interactive element.

    .spoiler-hidden {
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        filter: blur(6px);
        user-select: none;

        a {
            pointer-events: none; // Make links unclickable.
        }
    }
}

.spoiler-toggle:checked + .spoiler-content {
    .spoiler-hidden {
        filter: none;
        user-select: auto;

        a {
            pointer-events: auto; // Enable clicking on links when revealed.
        }
    }
}

.spoiler-container.fixed-blur {
    .spoiler-content:before {
        display: inline-block; // Block display within the inline flow.
        filter: blur(6px);
        content: 'SPOILER'; // Display the word "SPOILER".
    }

    .spoiler-content .spoiler-hidden {
        display: none; // Completely hide the actual content.
    }

    .spoiler-toggle:checked + .spoiler-content {
        &:before {
            content: none; // Hide the word "SPOILER".
        }

        .spoiler-hidden {
            display: inline; // Reveal the actual content.
        }
    }
}