@y1 : The Linear Gradient Start Y Coordinate Attribute

The y1 attribute defines the Y-coordinate of the starting point for a linear gradient vector. Together with x1, it establishes the origin point from which the gradient begins, determining the vertical component of the gradient’s angle and direction.

Usage

The y1 attribute is used to:

Define the vertical starting position of a linear gradient
Control gradient angle and direction when combined with x1/x2/y2
Support both relative (percentage) and absolute (unit-based) coordinates
Enable vertical, diagonal, and custom-angle gradients
Work with both objectBoundingBox (default) and userSpaceOnUse coordinate systems
Create data-driven gradient orientations through data binding
Position gradients for charts, visualizations, and UI elements

<svg xmlns="http://www.w3.org/2000/svg" width="400" height="200">
    <defs>
        <linearGradient id="verticalGradient" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#3498db" />
            <stop offset="100%" stop-color="#2c3e50" />
        </linearGradient>
    </defs>
    <rect x="10" y="10" width="380" height="180" fill="url(#verticalGradient)" />
</svg>

Supported Values

Value Type	Format	Description	Example
Percentage	`0%` to `100%`	Relative to shape bounding box (objectBoundingBox mode)	`y1="0%"`
Decimal	`0` to `1.0`	Relative coordinate (0=top, 1=bottom)	`y1="0.5"`
Length Units	`pt`, `px`, `mm`, `cm`, `in`	Absolute coordinates (userSpaceOnUse mode)	`y1="50pt"`
Default	`0%`	Used when attribute is omitted	-

Common Patterns

<!-- Top edge (default) -->
<linearGradient id="g1" y1="0%">

<!-- Center -->
<linearGradient id="g2" y1="50%">

<!-- Bottom edge -->
<linearGradient id="g3" y1="100%">

<!-- Absolute positioning -->
<linearGradient id="g4" y1="100pt" gradientUnits="userSpaceOnUse">

Supported Elements

The y1 attribute is supported on:

<linearGradient> - Defines linear gradient start Y position

Note: This attribute is NOT used with <radialGradient> elements, which use cx/cy and fx/fy instead.

Data Binding

Dynamic Vertical Gradient Positioning

Bind the y1 coordinate to data for dynamic gradient start position:

<!-- Model: { startY: 20 } -->
<svg width="400" height="300">
    <defs>
        <linearGradient id="dynamicY"
                        x1="0%"
                        y1="%"
                        x2="0%"
                        y2="100%">
            <stop offset="0%" stop-color="#3498db" />
            <stop offset="100%" stop-color="#2c3e50" />
        </linearGradient>
    </defs>
    <rect width="400" height="300" fill="url(#dynamicY)" />
</svg>

Data-Driven Gradient Angles

Calculate gradient angles from data:

<!-- Model: { angle: 135 } -->
<!-- Creates gradient at specified angle in degrees -->
<svg width="400" height="300">
    <defs>
        <linearGradient id="angleGrad"
                        x1="%"
                        y1="%"
                        x2="%"
                        y2="%">
            <stop offset="0%" stop-color="#9b59b6" />
            <stop offset="100%" stop-color="#3498db" />
        </linearGradient>
    </defs>
    <rect width="400" height="300" fill="url(#angleGrad)" />
</svg>

Chart Background with Data Position

Position gradient based on chart data ranges:

<!-- Model: { chartTopMargin: 10, chartHeight: 280 } -->
<svg width="500" height="300">
    <defs>
        <linearGradient id="chartBg"
                        x1="0%"
                        y1="%"
                        x2="0%"
                        y2="%">
            <stop offset="0%" stop-color="#ecf0f1" />
            <stop offset="100%" stop-color="#ffffff" />
        </linearGradient>
    </defs>
    <rect width="500" height="300" fill="url(#chartBg)" />
</svg>

Conditional Gradient Direction

Change gradient direction based on data orientation:

<!-- Model: { orientation: "vertical", color1: "#2ecc71", color2: "#27ae60" } -->
<svg width="400" height="200">
    <defs>
        <linearGradient id="orientGrad"
                        x1=""
                        y1=""
                        x2=""
                        y2="">
            <stop offset="0%" stop-color="" />
            <stop offset="100%" stop-color="" />
        </linearGradient>
    </defs>
    <rect width="400" height="200" fill="url(#orientGrad)" />
</svg>

Temperature Gradient Based on Range

Create vertical gradients representing temperature or value ranges:

<!-- Model: { minTemp: -20, maxTemp: 40, currentTemp: 15 } -->
<svg width="100" height="400">
    <defs>
        <linearGradient id="tempGrad" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#e74c3c" />
            <stop offset="50%" stop-color="#f39c12" />
            <stop offset="100%" stop-color="#3498db" />
        </linearGradient>
    </defs>

    <rect width="100" height="400" fill="url(#tempGrad)" />
    <!-- Temperature indicator -->
    <rect x="0"
          y=""
          width="100" height="5" fill="white" />
</svg>

Notes

Coordinate Systems

The y1 attribute behaves differently based on gradientUnits:

objectBoundingBox (default): Relative to filled shape
- Values 0-1 or 0%-100%
- 0% = top edge, 50% = center, 100% = bottom edge
- Gradient automatically scales with shape size
- Most common for responsive designs
userSpaceOnUse: Absolute document coordinates
- Values in pt, px, mm, cm, in
- Fixed position in document space
- Useful for consistent gradients across multiple shapes

Gradient Direction Patterns

Common gradient orientations using y1/y2:

<!-- Horizontal (no Y change) -->
<linearGradient x1="0%" y1="0%" x2="100%" y2="0%">

<!-- Vertical (top to bottom) -->
<linearGradient x1="0%" y1="0%" x2="0%" y2="100%">

<!-- Vertical (bottom to top) -->
<linearGradient x1="0%" y1="100%" x2="0%" y2="0%">

<!-- Diagonal (top-left to bottom-right) -->
<linearGradient x1="0%" y1="0%" x2="100%" y2="100%">

<!-- Diagonal (bottom-left to top-right) -->
<linearGradient x1="0%" y1="100%" x2="100%" y2="0%">

Default Behavior

Default value: 0% (top edge)
Default gradient: horizontal left-to-right (x1=”0%”, y1=”0%”, x2=”100%”, y2=”0%”)
Must be used with <linearGradient> only

Vertical Gradients for UI

Vertical gradients are commonly used for:

Bar charts (bottom-to-top data visualization)
Progress indicators
Temperature/level gauges
Background fills for cards and panels
Sky/ground effects
Depth perception in UI elements

Examples

Basic Vertical Gradient (Top to Bottom)

<svg width="400" height="300">
    <defs>
        <linearGradient id="vertical" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#3498db" />
            <stop offset="100%" stop-color="#2c3e50" />
        </linearGradient>
    </defs>
    <rect width="400" height="300" fill="url(#vertical)" />
</svg>

Vertical Gradient (Bottom to Top)

<svg width="400" height="300">
    <defs>
        <linearGradient id="bottomUp" x1="0%" y1="100%" x2="0%" y2="0%">
            <stop offset="0%" stop-color="#2ecc71" />
            <stop offset="100%" stop-color="#27ae60" />
        </linearGradient>
    </defs>
    <rect width="400" height="300" fill="url(#bottomUp)" />
</svg>

Gradient Starting from Center

<svg width="400" height="300">
    <defs>
        <linearGradient id="centerY" x1="0%" y1="50%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#ffffff" />
            <stop offset="100%" stop-color="#3498db" />
        </linearGradient>
    </defs>
    <rect width="400" height="300" fill="url(#centerY)" />
</svg>

Diagonal Gradient (Top-Left to Bottom-Right)

<svg width="400" height="300">
    <defs>
        <linearGradient id="diagonal1" x1="0%" y1="0%" x2="100%" y2="100%">
            <stop offset="0%" stop-color="#9b59b6" />
            <stop offset="100%" stop-color="#3498db" />
        </linearGradient>
    </defs>
    <rect width="400" height="300" fill="url(#diagonal1)" />
</svg>

Diagonal Gradient (Bottom-Left to Top-Right)

<svg width="400" height="300">
    <defs>
        <linearGradient id="diagonal2" x1="0%" y1="100%" x2="100%" y2="0%">
            <stop offset="0%" stop-color="#e74c3c" />
            <stop offset="100%" stop-color="#f39c12" />
        </linearGradient>
    </defs>
    <rect width="400" height="300" fill="url(#diagonal2)" />
</svg>

Vertical Bar Chart with Gradient

<svg width="500" height="400">
    <defs>
        <linearGradient id="barVertical" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#3498db" />
            <stop offset="100%" stop-color="#1a5490" />
        </linearGradient>
    </defs>

    <!-- Chart bars with vertical gradient -->
    <rect x="50" y="150" width="60" height="220" fill="url(#barVertical)" />
    <rect x="130" y="100" width="60" height="270" fill="url(#barVertical)" />
    <rect x="210" y="180" width="60" height="190" fill="url(#barVertical)" />
    <rect x="290" y="130" width="60" height="240" fill="url(#barVertical)" />
    <rect x="370" y="160" width="60" height="210" fill="url(#barVertical)" />
</svg>

Progress Bar with Vertical Fill

<svg width="100" height="400">
    <defs>
        <linearGradient id="progressVert" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#2ecc71" />
            <stop offset="100%" stop-color="#27ae60" />
        </linearGradient>
    </defs>

    <!-- Background -->
    <rect x="20" y="0" width="60" height="400" rx="30" fill="#ecf0f1" />
    <!-- Progress (70%) -->
    <rect x="20" y="120" width="60" height="280" rx="30" fill="url(#progressVert)" />
</svg>

Temperature Gauge

<svg width="150" height="400">
    <defs>
        <linearGradient id="tempScale" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#e74c3c" />
            <stop offset="25%" stop-color="#f39c12" />
            <stop offset="50%" stop-color="#f1c40f" />
            <stop offset="75%" stop-color="#3498db" />
            <stop offset="100%" stop-color="#2980b9" />
        </linearGradient>
    </defs>

    <rect x="50" y="20" width="50" height="360" rx="25" fill="url(#tempScale)" />
    <text x="75" y="15" text-anchor="middle" font-size="12">Hot</text>
    <text x="75" y="395" text-anchor="middle" font-size="12">Cold</text>
</svg>

Sky Background Gradient

<svg width="600" height="400">
    <defs>
        <linearGradient id="sky" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#3498db" />
            <stop offset="50%" stop-color="#89cff0" />
            <stop offset="100%" stop-color="#e8f4f8" />
        </linearGradient>
    </defs>

    <rect width="600" height="400" fill="url(#sky)" />
</svg>

Card with Vertical Gradient Header

<svg width="400" height="500">
    <defs>
        <linearGradient id="cardGrad" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#667eea" />
            <stop offset="100%" stop-color="#764ba2" />
        </linearGradient>
    </defs>

    <!-- Card body -->
    <rect width="400" height="500" rx="8" fill="#ffffff" stroke="#ddd" />
    <!-- Header with gradient -->
    <rect width="400" height="150" rx="8" fill="url(#cardGrad)" />

    <text x="20" y="50" fill="white" font-size="32" font-weight="bold">
        Profile
    </text>
    <text x="20" y="85" fill="white" font-size="16" opacity="0.9">
        User Dashboard
    </text>
</svg>

Data Visualization: Stacked Area Chart

<svg width="600" height="300">
    <defs>
        <linearGradient id="area1" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#3498db" stop-opacity="0.8" />
            <stop offset="100%" stop-color="#3498db" stop-opacity="0.1" />
        </linearGradient>
    </defs>

    <path d="M 0,200 L 100,180 L 200,150 L 300,170 L 400,140 L 500,160 L 600,150 L 600,300 L 0,300 Z"
          fill="url(#area1)" />
</svg>

Vertical Heatmap Column

<svg width="100" height="400">
    <defs>
        <linearGradient id="heatColumn" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#c0392b" />
            <stop offset="20%" stop-color="#e74c3c" />
            <stop offset="40%" stop-color="#e67e22" />
            <stop offset="60%" stop-color="#f1c40f" />
            <stop offset="80%" stop-color="#2ecc71" />
            <stop offset="100%" stop-color="#27ae60" />
        </linearGradient>
    </defs>

    <rect x="20" y="20" width="60" height="360" fill="url(#heatColumn)" />
    <text x="50" y="10" text-anchor="middle" font-size="10">High</text>
    <text x="50" y="395" text-anchor="middle" font-size="10">Low</text>
</svg>

Gauge Indicator with Vertical Gradient

<svg width="200" height="300">
    <defs>
        <linearGradient id="gaugeVert" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#2ecc71" />
            <stop offset="50%" stop-color="#f39c12" />
            <stop offset="100%" stop-color="#e74c3c" />
        </linearGradient>
    </defs>

    <rect x="70" y="50" width="60" height="200" rx="30" fill="url(#gaugeVert)" />
    <rect x="60" y="50" width="80" height="8" fill="white" />
</svg>

Battery Level Indicator

<svg width="150" height="300">
    <defs>
        <linearGradient id="battery" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#2ecc71" />
            <stop offset="100%" stop-color="#27ae60" />
        </linearGradient>
    </defs>

    <!-- Battery outline -->
    <rect x="35" y="30" width="80" height="240" rx="10" fill="none" stroke="#2c3e50" stroke-width="3" />
    <!-- Battery terminal -->
    <rect x="55" y="15" width="40" height="15" rx="5" fill="#2c3e50" />
    <!-- Battery fill (60%) -->
    <rect x="40" y="126" width="70" height="138" rx="8" fill="url(#battery)" />
</svg>

Vertical Slider Track

<svg width="100" height="400">
    <defs>
        <linearGradient id="slider" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#3498db" />
            <stop offset="100%" stop-color="#1a5490" />
        </linearGradient>
    </defs>

    <rect x="40" y="20" width="20" height="360" rx="10" fill="url(#slider)" />
    <circle cx="50" cy="200" r="15" fill="white" stroke="#3498db" stroke-width="3" />
</svg>

Data-Driven Vertical Range

<!-- Model: { minValue: 0, maxValue: 100, currentValue: 65 } -->
<svg width="150" height="400">
    <defs>
        <linearGradient id="dataRange"
                        x1="0%"
                        y1="%"
                        x2="0%"
                        y2="100%">
            <stop offset="0%" stop-color="#f39c12" />
            <stop offset="100%" stop-color="#e74c3c" />
        </linearGradient>
    </defs>

    <rect x="50" y="20" width="50" height="360" rx="25" fill="url(#dataRange)" />
    <text x="75" y="20"
          text-anchor="middle" font-size="14" fill="white" font-weight="bold">
        %
    </text>
</svg>