diff --git a/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.cpp b/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.cpp
index d05435182a..b74c357a82 100644
--- a/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.cpp
+++ b/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.cpp
@@ -242,6 +242,19 @@ GLenum WebGLRenderingContextBase::get_error()
     return m_context->gl_get_error();
 }
 
+void WebGLRenderingContextBase::line_width(GLfloat width)
+{
+    if (m_context_lost)
+        return;
+
+    dbgln_if(WEBGL_CONTEXT_DEBUG, "WebGLRenderingContextBase::line_width(width={})", width);
+
+    // https://www.khronos.org/registry/webgl/specs/latest/1.0/#NAN_LINE_WIDTH
+    // "In the WebGL API, if the width parameter passed to lineWidth is set to NaN, an INVALID_VALUE error is generated and the line width is not changed."
+    RETURN_WITH_WEBGL_ERROR_IF(isnan(width), GL_INVALID_VALUE);
+    m_context->gl_line_width(width);
+}
+
 void WebGLRenderingContextBase::polygon_offset(GLfloat factor, GLfloat units)
 {
     if (m_context_lost)
diff --git a/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.h b/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.h
index d5fe6313a8..c5de9b6fdd 100644
--- a/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.h
+++ b/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.h
@@ -48,6 +48,7 @@ public:
 
     GLenum get_error();
 
+    void line_width(GLfloat width);
     void polygon_offset(GLfloat factor, GLfloat units);
 
     void scissor(GLint x, GLint y, GLsizei width, GLsizei height);
diff --git a/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.idl b/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.idl
index 1e536e8817..0095c9fae9 100644
--- a/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.idl
+++ b/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.idl
@@ -43,6 +43,7 @@ interface mixin WebGLRenderingContextBase {
 
     GLenum getError();
 
+    undefined lineWidth(GLfloat width);
     undefined polygonOffset(GLfloat factor, GLfloat units);
 
     undefined scissor(GLint x, GLint y, GLsizei width, GLsizei height);