scroll-margin-block-start · Properties · CSS

The scroll-margin-block-start CSS property specifies the block-start edge of the scroll snap area.

Syntax

CSS

scroll-margin-block-start: value;

JS

object.style.scrollMarginBlockStart = "value";

Values

<'scroll-margin-block-start'> = <length>

<length>

Specifies the length using a number followed by a unit of measurement.

<!doctype html>
<html>
<head>
    <style>
        .myclass
        {
            display: grid;
            grid-template-rows: repeat(3, 100%);
            height: 50vh;
            overflow-y: scroll;
            scroll-snap-type: block mandatory;
            width: 50%;
        }
        .myclass > div
        {
            background-image: linear-gradient(135deg, white, lightgray);
            scroll-snap-align: start;
        }
    </style>
</head>
<body>
    <button onmouseover="myfunction(innerHTML)">initial</button>
    <button onmouseover="myfunction(value)" value="20px">length</button>
    <div class="myclass">
        <div>scroll-margin-block-start</div>
        <div>scroll-margin-block-start</div>
        <div>scroll-margin-block-start</div>
    </div>
    <script>
        function myfunction(myparameter)
        {
            const myelements = document.querySelectorAll(".myclass > div");
            for(let myelement of myelements)
            {
                myelement.style.scrollMarginBlockStart = myparameter;
            }
        }
    </script>
</body>
</html>

3 · JS · Internal

<!doctype html>
<html>
<head>
    <style>
        .myclass
        {
            display: grid;
            grid-template-rows: repeat(3, 100%);
            height: 50vh;
            overflow-y: scroll;
            scroll-snap-type: block mandatory;
            width: 50%;
        }
        .myclass > div
        {
            background-image: linear-gradient(135deg, white, lightgray);
            scroll-snap-align: start;
        }
    </style>
</head>
<body>
    <button>initial</button>
    <button value="20px">length</button>
    <div class="myclass">
        <div>scroll-margin-block-start</div>
        <div>scroll-margin-block-start</div>
        <div>scroll-margin-block-start</div>
    </div>
    <script>
        function myfunction(myparameter)
        {
            const myelements = document.querySelectorAll(".myclass > div");
            for(let myelement of myelements)
            {
                myelement.style.scrollMarginBlockStart = myparameter;
            }
        }
        const myelements = document.querySelectorAll("button");
        for(let myelement of myelements)
        {
            let myargument = myelement.innerHTML;
            if(myelement.value)
            {
                myargument = myelement.value;
            }
            myelement.addEventListener("mouseover", function(){myfunction(myargument)});
        }
    </script>
</body>
</html>